/**
 * Validate and submit contact form
 * @return boolean
 */
function contactSubmit() {
	
	if(document.contactForm.name.value==''){
		alert("Please enter your name");
	}else if(document.contactForm.email.value==''){
		alert("Please enter your reply email address");
	}else if(!validateEmail(document.contactForm.email.value)){
		alert("Your email address is not valid, please try again");
	}else if(document.contactForm.subject.value==''){
		alert("Please select a subject");
	}else if(document.contactForm.enquiry.value==''){
		alert("Please give us some details about your enquiry");
	}else{
		document.contactForm.submit();
		return true;
	}
	
	return false;
	
}

/**
 * Basic validate email address function on email format
 *
 * @param string str
 * @return boolean
 */
function validateEmail(str) {

	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	   return false;
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   return false;
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
	    return false;
	}

	if (str.indexOf(at,(lat+1))!=-1){
	   return false;
	}

	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
	   return false;
	}

	if (str.indexOf(dot,(lat+2))==-1){
	   return false;
	}
	
	if (str.indexOf(" ")!=-1){
	   return false;
	}

	return true					
}