function openAdmin(fileName) {
	win4490 = open(fileName,"SchulerAuktionenZürich","width=720,height=650,left=100,top=50,dependent=no,location=no,toolbar=no,menubar=no,resizable=no,scrollbars=yes");
}

function onlyNums(obj){
	var strValidChars = "0123456789";
	var strChar;
	var retChar = "";
	var strString = obj.value;
	for (i = 0; i < strString.length ; i++){
		strChar = strString.charAt(i);
		if (strValidChars.indexOf(strChar) != -1)
			retChar = retChar + strChar;
	}
	obj.value = retChar;
}