function validate()
{
	var valid = true;
	if (document.getElementById("manufacturer").value=="")
	{ 
		document.getElementById("manufacturer").style.background="red";
		valid = false; 
	}
	
	if (document.getElementById("year").value=="")
	{ 
		document.getElementById("year").style.background="red";
		valid = false; 
	}
	
	if (document.getElementById("model").value=="")
	{ 
		document.getElementById("model").style.background="red";
		valid=false;
	}
	
	if (document.getElementById("chassis").value=="")
	{ 
		document.getElementById("chassis").style.background="red";
		valid = false;
	}
	
	return valid;
}

function validateForm()
{
	if(validate() == false)
	{
		alert('A required value is missing!');
		return false;
	}
	return true;


}