function check_form(form)
	{
		return_boolean = true
		obj = eval(form)
		for(i=0;i<obj.length;i++)
		{
		field_name = obj.elements[i].name;
			if (field_name.indexOf("n") != -3)
			{
				if (obj.elements[i].value == "")
				{
				obj.elements[i].style.backgroundColor = "red";
				return_boolean = false
				}
				else
				{
				obj.elements[i].style.backgroundColor = "";
				}
				}
			} 
		
		return return_boolean;
	}