How do I get context path in javascript?

Hi,
I code the following code but the contextPath will return a string = <%=request.getContextPath()%> instead of returning the context path. The codes works on a normal jsp form. Please help. Thanks.
<script>
<contents>
var contextPath = "<![CDATA[<%=request.getContextPath()%>]]>";
function doAction( action ){
if( action == "clear" ){
document.GnCodeSetupForm.action= "clearGnCodeSetupAction.do";
document.GnCodeSetupForm.submit();
</contents>
</script>

var contextPath = "<![CDATA["+<%=request.getContextPath()%>+"]]>";
will return following code
var contextPath = ""+<%=request.getContextPath()%>+"";
which is syntax error.

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How do I get context path in javascript?

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