iframe

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How do clear the iframe in netscape 7.0 and Internet explorer. The following code works in IE but not in netscape

<html>
<head>
<title>Simple Math Practice</title>


<script language="javascript" type="text/javascript">
<!-- Hide Script
function RandPosInt() {
Rnum = Math.round(Math.random()*8+1);
return Rnum;
}

function WriteHeader() {
problem.document.write('<html><head><link href="math.css" rel="stylesheet" type="text/css"><\/head><body>');
}

function WriteContent() {
problem.document.write("this is content");
}

function WriteFooter() {
problem.document.write("<\/body><\/html>");
}

function ClearFrame() {
problem.document.open();
problem.document.clear();
}

function CloseFrame() {
problem.document.close();
}


// End Hiding Script -->
</script>


<link href="math.css" rel="stylesheet" type="text/css">
</head>
<body>
<div align="center">
<h1>Simple Math Practice</h1>

<iframe
src="defaultframe.html" id="problem" name="problem" frameborder="1" marginwidth="10" marginheight="10" scrolling="no" align="top" height="200" width="500">
</iframe>


<script language="javascript" type="text/javascript">
<!-- Hide Script
//FirstNum = RandPosInt();
//problem.document.write("Test1");
ClearFrame();
WriteHeader();
WriteContent();
WriteFooter();
CloseFrame();

// End Hiding Script -->
</script>

</div>
</body>
</html>
 
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