Here is a way to loop through form elements (where form id is myform) and print them into a popup debug window.

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function ShowFormValues()
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{
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debugwindow = window.open("", "debugwindow", 'scrollbars=yes,resizable=yes,width=250,height=250');
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        var myelements = document.getElementById("myform").elements;
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        for(var i=0; i < myelements.length; i++)
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            {
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                debugwindow.document.write("type:" + myelements[i].type + "  ");
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                debugwindow.document.write("name:" + myelements[i].name + "  ");
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                debugwindow.document.write("value:" + myelements[i].value + "  ");
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                debugwindow.document.write("<br />");
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            }
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}
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