function checkInput(e)
{
	var key;
	var keychar;
	var reg;

	if(window.event)
	{
		// for IE, e.keyCode or window.event.keyCode can be used
		key = e.keyCode;
	}
	else if(e.which)
	{
		// netscape
		key = e.which;
	}
	else
	{
		// no event, so pass through
		return true;
	}

	keychar = String.fromCharCode(key);
	reg = /[0-9\b]/;
	//return reg.test(keychar);
	
	if(reg.test(keychar)==true)
	{
		return true;
	}
	else
	{
		alert("Only values 0-9 can be entered in this field.");
		return false;
	}
}

function isFilled(elm)
{
	if(elm.value == "" || elm.value == null)
	{
		return false;
	}
	else
	{
		return true;
	}
}

function checkMail(address)
{
	var x = address;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	
	if (filter.test(x))
	{
		return true;
	}
	else
	{
		return false;
	}
}