change pop up to only show OK .Right now i am showing both OK and CANCEL

change pop up to only show OK .Right now i am showing both OK and CANCEL

<SCRIPT type="text/javascript">
var string=document.referrer;
if(string.search('Application.jsp')>1){
window.onload = function()
{
var y="<%=""+ EPermitMessages.getGPCLargeText("193","01")+""%>";
var x="<%=""+ EPermitMessages.getGPCLargeText("193","02")+""%>";
if (window.confirm(y+x))
{
}
};
}
</SCRIPT>