// Checks whether any fields which are required are missing and alerts the user
function checkSubmit(){

var fname = document.getElementById('fname').value;
var lname = document.getElementById('lname').value;
var email = document.getElementById('email').value;
var company = document.getElementById('company').value;
var postcode = document.getElementById('postcode').value;
var hfind = document.getElementById('hfind').value;


var check = 0;
var missing='';


if ((fname==null)||(fname=="")||(fname=="First Name")){
check = 1;	
missing = missing + 'First Name, ';
}
if ((lname==null)||(lname=="")||(lname=="Last Name")){
check = 1;	
missing = missing + 'Last Name, ';
}

if ((email==null)||(email=="")||(email=="E-Mail")){
check = 1;	
missing = missing + 'E-Mail, ';
}
if ((company==null)||(company=="")||(company=="Company")){
check = 1;	
missing = missing + 'Company, ';
}

if ((postcode==null)||(postcode=="")||(postcode=="Postcode")){
check = 1;
missing = missing + 'Postcode, ';
}
if ((hfind==null)||(hfind=="")){
check = 1;	
missing = missing + 'How you found us?';
}


if (check == 1){
	alert('The following fields are missing: ' + missing);
}else{
	if (emailcheck(email)==true){
		document.enquiryform.submit()
	}
	
}
	

}

// Checks whether a given string has a valid email format i.e. someone@somewhere.com
function emailcheck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Please enter a valid email addresss.")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Please enter a valid email addresss.")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Please enter a valid email addresss.")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Please enter a valid email addresss.")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Please enter a valid email addresss.D")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Please enter a valid email addresss.")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Please enter a valid email addresss.")
		    return false
		 }

 		 return true					
	}