function incrementUpDownBox(minVal, maxVal, incVal, incUp, el) {
	var cVal = parseInt(el.value);
	
	if (incUp) { cVal += incVal; }
	else	   { cVal -= incVal; }
	
	if (cVal<minVal) { cVal = minVal; }
	if (cVal>maxVal) { cVal = maxVal; }
	
	el.value = cVal;
	
	event.returnValue=false;
	event.cancelBubble=true;
}

function setvalueUpDownBox(val, el) { 
	el.value = val; 
	
	event.returnValue=false; 
	event.cancelBubble=true;
}

function filterKeys() {
	if (event.srcElement.value.length>=3) {
		event.returnValue = false;
		event.cancelBubble = true;
	}
	if (!((event.keyCode>=48) & (event.keyCode<=57))) {
		event.returnValue = false;
		event.cancelBubble = true;
	}
}

function filterBlank() {
	if (event.srcElement.value.length==0) {
		event.srcElement.value = '0';
	}
}