function check_INPUT(obj)
{
	var value=parseFloat(obj.value),name=obj.name;
	var error="Error! "+obj.value+" is not a number."
	if(isNaN(value))
	{
		alert(error);
		obj.value=0;
	} else obj.value=my_round(value);
}

function my_round(num)
{
	num=Math.round(num*100)/100;
	
	num=num.toFixed(2)
	
	if (isNaN(num)) num='';
	return num;
}