function fieldfilter(evnt, regex) {

    var theChar="", theRegExp=/[0-9,\010]/, bFound=false;

    if(document.all) {
      evnt=window.event;
 	  theChar=String.fromCharCode(evnt.keyCode);
    if(!evnt.shiftKey) theChar=theChar.toLowerCase();
       bFound=regex.test(theChar);
       evnt.returnValue=bFound;
    } else if (document.layers) {
       theChar=String.fromCharCode(evnt.which);
       bFound=regex.test(theChar)
    } else {
       theChar = String.fromCharCode(evnt.charCode);
       bFound = (evnt.keyCode!=0) || regex.test(theChar);
       evnt.cancelBubble=!bFound;
    }
    return bFound;
}

function checkboxValueChange(elementName) {
	var r;
	if(document.getElementById(elementName).value == 0) {
		r = 1;
	} else {
		r = 0;
	}
		document.getElementById(elementName).value = r;
}