<script>
function ValidatePage()
{
var theSpan = document.getElementById("A1");
var a = theSpan.getElementsByTagName("input"); /* this captures the textbox */
for( var i = a.length-1; i >= 0; i-- )
{
var link = a[i];
if( link.id.match(/PRMT_TB_/))
          {phoneRegex = /^\(\d{3}\) \d{3}-\d{4}$/; /* This is regular expression to allow only the strings in (nnn) nnn-nnnn format */
            if( !link.value.match( phoneRegex ) ) {
            alert( 'Please enter phone number in (nnn)nnn-nnnn format' );
            link.focus();
            link.select();
            return; }
          else {promptButtonFinish();}
          }
}
}
/* Below is standard code to get FormWarpRequest*/
var fW = (typeof getFormWarpRequest == "function" ?getFormWarpRequest() : document.forms["formWarpRequest"]);
if ( !fW || fW == undefined) { fW = ( formWarpRequest_THIS_ ?formWarpRequest_THIS_ : formWarpRequest_NS_ );}
/* This returns all elements of Button tag */var buttons = fW.getElementsByTagName("BUTTON");
for (var i=0; i<buttons.length; i++)
{       
         if (buttons[i].id.match(/finish/)) // Capture the finish button
          {
                   if (buttons[i].onclick.toString().indexOf('finish') > 0) 
                   { buttons[i].onclick = ValidatePage;} /* This overrides the FINISH button and attaches it to our function */
          }
}
</script>