javascript conform box

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<script type="text/javascript">
function Validate(event) 
{
var thereturn = confirm("Are you sure want to delete the profile?");
if (event) 
{
        if (!thereturn)
{
event.preventDefault();
}
} 
else 
{
return thereturn;
}
}
window.onload = function()
{ 
document.getElementById('delete-form').onsubmit = Validate;
};
</script>
<input type="submit" class="submit redform" value="delete"  onclick="Validate(event)" />