// Tillad kun tal
var char_codes = new Array();
char_codes[48] = 0;
char_codes[49] = 1;
char_codes[50] = 2;
char_codes[51] = 3;
char_codes[52] = 4;
char_codes[53] = 5;
char_codes[54] = 6;
char_codes[55] = 7;
char_codes[56] = 8;
char_codes[57] = 9;

function onlyNumbers(evt, field) {
	var charCode = (evt.which)? evt.which : event.keyCode;
	if (charCode > 47 && charCode < 58) {
		return true;
	} else {
		return false;
	}
}