function popup(str, width, height) {
		x = (screen.width-width)/2;
		y = (screen.height-height)/2;
        searchWin = window.open(str,'15','scrollbars=yes,resizable=no,width='+width+',height='+height+',top='+y+',left='+x+',status=no,location=no,toolbar=no');
		if(!searchWin.opener) searchWin.opener=self;	
		if(searchWin.focus!=null) searchWin.focus();

}