window.showModalDialog

I'm trying to use window.showModalDialog to open a jsp that uses struts but I'm having problems getting the url right. See code snippet below. This code opens a window, but not to the correct url and when I close the dialog box  the alert reads returnValueDialog: undefined. Any help would be greatly appreciated.
sURL = "Request.do?parameter=someParameter";
var returnValueDialog  = window.showModalDialog(sURL, "", "dialogWidth:9cm; dialogHeight:6cm; status:yes")
alert("returnValueDialog: "+returnValueDialog);

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GlobexCorpAsked:
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objectsConnect With a Mentor Commented:
the url needs to be relative to the url of thae page that code pappears in

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