function openwin(url, b, h) {
	if (b == null) { var b = 450; }
	if (h == null) { var h = 450; } //window.screen.availHeight-100;	}
	var offset = 25;
	var links = (window.screen.availWidth-b)/2;
	var oben = ((window.screen.availHeight-h)/2)-offset;
	newwin = window.open(url,'Formular','toolbar=0,menubar=0,location=0,status=0,scrollbars=1,resizable=1,width='+b+',height='+h+',top='+oben+',left='+links); 
	setTimeout('newwin.focus();',200); 
}