javascript 숫자만 입력받기

#only number

JS :

function onlyNumber(event){
	event = event || window.event;
	var keyID = (event.which) ? event.which : event.keyCode;
	if ( (keyID >= 48 && keyID <= 57) || (keyID >= 96 && keyID <= 105) || keyID == 8 || keyID == 46 || keyID == 37 || keyID == 39 ) 
		return;
	else
		return false;
}
function removeChar(event) {
	event = event || window.event;
	var keyID = (event.which) ? event.which : event.keyCode;
	if ( keyID == 8 || keyID == 46 || keyID == 37 || keyID == 39 ) 
		return;
	else
		event.target.value = event.target.value.replace(/[^0-9]/g, "");
}

HTML :