function validateContactForm()
{
		if(document.getElementById('nameField').value.length==0)
		{
			alert('Please provide name');
			return false;
		}

		else if(validateEmail(document.getElementById('emailField').value)==false)
		{
			alert('Please provide a valid email address');
			return false;
		}

		else if(document.contactForm.messageField.value.length==0)
		{
			alert('Please provide message');
			return false;
		}
		
		else
		{
			return true;
		}

	
}

function validateEmail(string)
{

	if(string.length===0)
	{
		return false;
	}
	
	apos=string.indexOf("@");
	dotpos=string.lastIndexOf(".");
	
	if (apos<1||dotpos-apos<2)
	{
		
		return false;
	}
	
	else 
	{
		return true;
	}

}