Javascript 请注意，表单现在具有ID属性。我还更改了每个单选按钮的ID，因为它们应该是唯一的。例如，var priceTotal.src或var priceTotal:src不能作为priceTotal.src和priceTotal:src有效的变量名使用。感谢您的帮

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请注意，表单现在具有ID属性。我还更改了每个单选按钮的ID，因为它们应该是唯一的。例如，var priceTotal.src或var priceTotal:src不能作为priceTotal.src和priceTotal:src有效的变量名使用。感谢您的帮助，但即使进行了这些更改，它在Firefox中仍然不起作用。除Firefox外，其他所有浏览器（包括IE6）在JS上都很酷，工作正常：\

function priceChange()
    {
        var hostOpt = document.getElementById("host").value;
        var emailOpt = document.getElementById("email").value;
        var priceImg = new Array()
        priceImg[0] = new Image();
        priceImg[0].src = "images/total1.png";
        priceImg[1] = new Image();
        priceImg[1].src = "images/total2.png";
        priceImg[2] = new Image();
        priceImg[2].src = "images/total3.png";
        priceImg[3] = new Image();
        priceImg[3].src = "images/total4.png";
        priceImg[4] = new Image();
        priceImg[4].src = "images/total5.png";

        if (hostOpt == "opt1" && emailOpt == "opt1")
        {
            document.getElementById("priceTotal").src = priceImg[0].src;
        }
        else if (hostOpt == "opt2" && emailOpt == "opt1")
        {
            document.getElementById("priceTotal").src = priceImg[1].src;
        }
        else if (hostOpt == "opt3" && emailOpt == "opt1")
        {
            document.getElementById("priceTotal").src = priceImg[2].src;
        }
        else if (hostOpt == "opt1" && emailOpt == "opt2")
        {
            document.getElementById("priceTotal").src = priceImg[1].src;
        }
        else if (hostOpt == "opt2" && emailOpt == "opt2")
        {
            document.getElementById("priceTotal").src = priceImg[2].src;
        }
        else if (hostOpt == "opt3" && emailOpt == "opt2")
        {
            document.getElementById("priceTotal").src = priceImg[3].src;
        }
        else if (hostOpt == "opt1" && emailOpt == "opt3")
        {
            document.getElementById("priceTotal").src = priceImg[2].src;
        }
        else if (hostOpt == "opt2" && emailOpt == "opt3")
        {
            document.getElementById("priceTotal").src = priceImg[3].src;
        }
        else if (hostOpt == "opt3" && emailOpt == "opt3")
        {
            document.getElementById("priceTotal").src = priceImg[4].src;
        }
    }

<div id="planHost" class="planOptions">
            <h5>Hosting options:</h5>
            <br/>
            <form>
                <p><input type="radio" name="host" value="opt1" id="host"/>Base</p>
                <p><input type="radio" name="host" value="opt2" id="host"/>Premium (+$5)</p>
                <p><input type="radio" name="host" value="opt3" id="host"/>Ultra (+$10)</p>
                <br/><br/>
                <input type="button" id="changeHost" name="changeHost" value="Submit" onclick="priceChange()">
            </form>
        </div>
        <div id="planEmail" class="planOptions">
            <h5>Email options:</h5>
            <br/>
            <form>
                <p><input type="radio" name="email" value="opt1" id="email"/>Base</p>
                <p><input type="radio" name="email" value="opt2" id="email"/>Premium (+$5)</p>
                <p><input type="radio" name="email" value="opt3" id="email"/>Ultra (+$10)</p>
                <br/><br/>
                <input type="button" id="changeHost" name="changeHost" value="Submit" onclick="priceChange()">
            </form>
        </div>

function priceChange() /*Changes the plan price and the plan details*/
    {



        for (var i=0; i<document.emailChange.email.length; i++)
        {
            if (document.emailChange.email[i].checked)
            {
                emailOpt = document.emailChange.email[i].value;
            }
        }

        for (var i=0; i<document.hostingChange.host.length; i++)
        {
            if (document.hostingChange.host[i].checked)
            {
                hostOpt = document.hostingChange.host[i].value;
            }
        }


        <!--alert("Your new total cost per month");-->
        var priceImgSrc1 = "images/total1.png";
        var priceImgSrc2 = "images/total2.png";
        var priceImgSrc3 = "images/total3.png";
        var priceImgSrc4 = "images/total4.png";
        var priceImgSrc5 = "images/total5.png";
        var emailImgSrc1 = "images/email1.png";
        var emailImgSrc2 = "images/email2.png";
        var emailImgSrc3 = "images/email3.png";
        var hostImgSrc1 = "images/host1.png";
        var hostImgSrc2 = "images/host2.png";
        var hostImgSrc3 = "images/host3.png";


        var priceTotalImg = document.getElementById("priceTotal").src;

        if (hostOpt == "Hopt1" && emailOpt == "Eopt1") {
          var priceTotal.src = priceImgSrc1;
          var hostImage.src = hostImgSrc1;
          var emailImage.src = emailImgSrc1;
        }
        else if (hostOpt == "Hopt2" && emailOpt == "Eopt1") {
          var priceTotal.src = priceImgSrc2;
          var hostImage.src = hostImgSrc2;
          var emailImage.src = emailImgSrc1;
        }
        else if (hostOpt == "Hopt3" && emailOpt == "Eopt1") {
          var priceTotal.src = priceImgSrc3;
          var hostImage.src = hostImgSrc3;
          var emailImage.src = emailImgSrc1;
        }
        else if (hostOpt == "Hopt1" && emailOpt == "Eopt2") {
          var priceTotal.src = priceImgSrc2;
          var hostImage.src = hostImgSrc1;
          var emailImage.src = emailImgSrc2;
        }
        else if (hostOpt == "Hopt2" && emailOpt == "Eopt2") {
          var priceTotal.src = priceImgSrc3;
          var hostImage.src = hostImgSrc2;
          var emailImage.src = emailImgSrc2;
        }
        else if (hostOpt == "Hopt3" && emailOpt == "Eopt2") {
          var priceTotal.src = priceImgSrc4;
          var hostImage.src = hostImgSrc3;
          var emailImage.src = emailImgSrc2;
        }
        else if (hostOpt == "Hopt1" && emailOpt == "Eopt3") {
          var priceTotal.src = priceImgSrc3;
          var hostImage.src = hostImgSrc1;
          var emailImage.src = emailImgSrc3;
        }
        else if (hostOpt == "Hopt2" && emailOpt == "Eopt3") {
          var priceTotal.src = priceImgSrc4;
          var hostImage.src = hostImgSrc2;
          var emailImage.src = emailImgSrc3;  
        }
        else if (hostOpt == "Hopt3" && emailOpt == "Eopt3") {
          var priceTotal.src = priceImgSrc5;
          var hostImage.src = hostImgSrc3;
          var emailImage.src = emailImgSrc3;
        }

    }

function getSelectedOption(radiogroup) {
  if (!radiogroup) return "";

  for(var i = 0; i < radiogroup.length; i++) {
    if(radiogroup[i].checked) return radiogroup[i].value;
  }

  return "";
}

function getSelectedOption(radiogroup) {
  if (!radiogroup) return "";


  for(var i = 0; i < radiogroup.length; i++) {
    if(radiogroup[i].checked) {
      return radiogroup[i].value;
    }
  }

  return "";
}

function priceChange() {
    var hostOpt = getSelectedOption(document.getElementById('planHostForm').elements['host']);
    var emailOpt = getSelectedOption(document.getElementById('emailForm').elements['email']);

    var priceImgSrc1 = "images/total1.png";
    var priceImgSrc2 = "images/total2.png";
    var priceImgSrc3 = "images/total3.png";
    var priceImgSrc4 = "images/total4.png";
    var priceImgSrc5 = "images/total5.png";

    var priceTotalImg = document.getElementById("priceTotal");

    if (hostOpt == "opt1" && emailOpt == "opt1") {
      priceTotalImg.src = priceImgSrc1;
    }
    else if (hostOpt == "opt2" && emailOpt == "opt1") {
      priceTotalImg.src = priceImgSrc2;
    }
    else if (hostOpt == "opt3" && emailOpt == "opt1") {
      priceTotalImg.src = priceImgSrc3;
    }
    else if (hostOpt == "opt1" && emailOpt == "opt2") {
      priceTotalImg.src = priceImgSrc2;
    }
    else if (hostOpt == "opt2" && emailOpt == "opt2") {
      priceTotalImg.src = priceImgSrc3;
    }
    else if (hostOpt == "opt3" && emailOpt == "opt2") {
      priceTotalImg.src = priceImgSrc4;
    }
    else if (hostOpt == "opt1" && emailOpt == "opt3") {
      priceTotalImg.src = priceImgSrc3;
    }
    else if (hostOpt == "opt2" && emailOpt == "opt3") {
      priceTotalImg.src = priceImgSrc4;
    }
    else if (hostOpt == "opt3" && emailOpt == "opt3") {
      priceTotalImg.src = priceImgSrc5;
    }
}

var hostOpt = getSelectedOption(document.getElementById('planHostForm').elements['host']);
var emailOpt = getSelectedOption(document.getElementById('emailForm').elements['email']);

<div id="planHost" class="planOptions">
            <h5>Hosting options:</h5>
            <br/>
            <form id="planHostForm">
                <p><input type="radio" name="host" value="opt1" id="host1"/>Base</p>
                <p><input type="radio" name="host" value="opt2" id="host2"/>Premium (+$5)</p>
                <p><input type="radio" name="host" value="opt3" id="host3"/>Ultra (+$10)</p>
                <br/><br/>
                <input type="button" id="changeHost" name="changeHost" value="Submit" onclick="priceChange()">
            </form>
        </div>

  <div id="planEmail" class="planOptions">
            <h5>Email options:</h5>
            <br/>
            <form id="emailForm">
                <p><input type="radio" name="email" value="opt1" id="email1"/>Base</p>
                <p><input type="radio" name="email" value="opt2" id="email2"/>Premium (+$5)</p>
                <p><input type="radio" name="email" value="opt3" id="email3"/>Ultra (+$10)</p>
                <br/><br/>
                <input type="button" id="changeHost" name="changeHost" value="Submit" onclick="priceChange()">
            </form>
        </div>

   var priceTotalImg = document.getElementById("priceTotal").src;

    if (hostOpt == "Hopt1" && emailOpt == "Eopt1") {
      var priceTotal.src = priceImgSrc1;
      var hostImage.src = hostImgSrc1;
      var emailImage.src = emailImgSrc1;
    }

   var priceTotalImg = document.getElementById("priceTotal").src;

    if (hostOpt == "Hopt1" && emailOpt == "Eopt1") {
      priceTotalImg.src = priceImgSrc1;
      hostImage.src = hostImgSrc1;
      emailImage.src = emailImgSrc1;
    }

var hostImage = document.getElementById("hostImage").src;
var emailImage = document.getElementById("emailImage").src;