How to determine if the location of the iframe has changed?

Question

I have got an iframe that displays a form from an external site,once the form is submitted it is redirected to another page that has got a thankyou message.Is it posiible to kno

Answer 1

function chkCounter(counterValue) {
       var tmp=document.getElementById('txtCounter').value;
       document.getElementById('txtCounter').value=tmp+counterValue;

       if(document.getElementById('txtCounter').value>1)
       {
        document.getElementById("btnClose").disabled = false;
       }
    }