function pop_up(URL,popName,Width,Height) 
	{
	if (Width =="" || Width == null) 
		{
		Width = 486;
		}
	if (Height == "" || Height == null)
		{
		Height = 500;
		}
	var features =',directories=0'+',location=0'+',menubar=0'+',scrollbars=1'+',status=0'+',toolbar=0'+',resizable=1'+',width='+Width+',height='+Height+',screenX=15'+',screenY=15'+',top=15'+',left=15';
	URL = URL.replace(/\s/,'%20');
	wind=window.open(URL, popName, features);
	wind.focus();
	return false;
	}