Pass prompt box variable from javascript to php

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Javascript

PHP

Hello I am having problem to pass the variable of javascript prompt box to php script . can any one find which mistake I have done in my following script .. Thank you

function confirmDelete()
{
var del = confirm("Please assign the profile to new name before deleting");
if(del==true)
{

var x=prompt("Enter here the new CIE name.","enter name");
if(x!=null && x!=" ")
{
window.location.href="delete.php?var="+x;
}

if(x==null || del==false || x==" ")
{
alert("Sorry!You can not delete profile without assigning to the other CIE");
return false;
}
}
else
{
return false;
}
}