// function that only allows input of 0-9,.,backspace
function numbersOnly(e) {
	var characterCode;
	if (e && e.which){
		e = e;
		characterCode = e.which;
	} else {
		e = event;
		characterCode = e.keyCode;
	}	 
	if(characterCode >= 48 && characterCode <= 57){
		return true;
	}
	if(characterCode == 8 || characterCode == 127){
		return true;
	} else {
		return false;
	}
}
function numbersOnlyPeriods(e) {
	var characterCode;
	if (e && e.which){
		e = e;
		characterCode = e.which;
	} else {
		e = event;
		characterCode = e.keyCode;
	}	 
	if(characterCode >= 48 && characterCode <= 57){
		return true;
	}
	if(characterCode == 46 || characterCode == 8 || characterCode == 127){
		return true;
	} else {
		return false;
	}
}
// JavaScript Document