function validate_required(field,alerttxt){
	with (field) {
		if (value==null||value==""){
			alert(alerttxt);
			return false
		}
		else {
			return true
		}
	}
}
function validate_email(field,alerttxt){
	with (field){
		apos=value.indexOf("@")
		dotpos=value.lastIndexOf(".")
		if (apos<1||dotpos-apos<2) 
			  {alert(alerttxt);return false}
		else {return true}
	}
}

function contactForm(thisform){
	with (thisform){
		if (validate_required(contactName,"Please enter your name")==false){
			contactName.focus();
			return false
		}
		if (validate_email(contactEmail,"Sorry, Not a valid e-mail address!")==false){
			contactEmail.focus();
			return false
		}
		if (validate_required(contactComments,"Please type in the message you would like to send to us.")==false){
			contactComments.focus();
			return false
		}
	}
}

function petitionForm(thisform){
	with (thisform){
		if (validate_required(contactName,"Please enter your name")==false){
			contactName.focus();
			return false
		}
		if (validate_email(contactEmail,"Sorry, Not a valid e-mail address!")==false){
			contactEmail.focus();
			return false
		}
		if (validate_required(contactPostcode,"Please enter your postcode")==false){
			contactPostcode.focus();
			return false
		}
	}
}