Calling a URL using JavaScript even handler

When I'm trying to call another URL using JavaScript, it doesn't work.
I did following things,
1).Created a Button
2).In javascript event handler, I'm calling Javascript function doSearch()
3). I wrote this function in Header Text Section of the Form Tex as below
<SCRIPT language="JavaScript">
function doSearch() {
location="http://www.oracle.com"
</SCRIPT>
When I saw the source of that button, it shows me as following,
--<TABLE BORDER="0" CELLSPACING="0" CELLPADDING="0"><TR><TD>
<INPUT TYPE="BUTTON" NAME="FORM_TO_CALL_CUSTOM.DEFAULT.CALL_REPORT.01" VALUE="CALL_REPORT" onClick="doSearch(); do_event(this.form,this.name,1,'ON_CLICK','');">
</TD></TR></TABLE></TD></TR></TABLE>
But, it doesn't call that URL.
Plz. guide me.
null

Sorry, the code for the CALL_Report button is as follow.
--<Tab BORDER="0" CELLSPACING="0" CELLPADDING="0"><TR><TD>
<INPUT TYPE="BUTTON" NAME="FORM_TO_CALL_CUSTOM.DEFAULT.CALL_REPORT.01" VALUE="CALL_REPORT" onClick="doSearch(); do_event(this.form,this.name,1,'ON_CLICK','');">
</TD></TR></TABLE></TD></TR></TABLE
null

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