[brand]

Решил проблему таким путем:

var w;
function chooseUser`fieldName`()
			{
				
				
				w = window.open(url,"","height=340,width=680,scrollbars=yes,resizable=yes,menubar=no,toolbar=yes,status=yes");			
								
				if ( w.focus )
				{
					w.focus();
				}		
				
				WaitForClose();
			}
			
			function WaitForClose()
			{				
				if(!w.closed)
				{					
					setTimeout("WaitForClose()", 300);
				}
				else
				{								
					alert("Closed!");					
				}
			}