var popUpWin=0;

function popUpWindow() {

var URLStr = 'http://www.internationalstudentloan.com/includes/mru_cosigner.html';
var left = 300;
var top = 100;
var width = 500;
var height = 400;

	if(popUpWin) {
	    if(!popUpWin.closed) popUpWin.close();
	}

  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');

}