function checkform ( form ) {
  
  if (form.firstname.value == "") {
    alert("You need to complete the First Name field");
	form.firstname.focus();
    return false;
  }
  
  if (form.surname.value == "") {
    alert("You need to complete the Surname field");
	form.surname.focus();
    return false;
  }
  
		if ((form.email.value==null)||(form.email.value=="")){
			alert("Please Enter your Email ID");
			form.email.focus();
			return false;
		}
		
		if (echeck(form.email.value)==false){
			form.email.value="";
			form.email.focus();
			return false;
		}
  
  if (form.address.value == "") {
    alert("You need to complete the Address field");
	form.address.focus();
    return false;
  }
  
  if (form.town.value == "") {
    alert("You need to complete the Town field");
	form.town.focus();
    return false;
  }
  
  if (form.postcode.value == "") {
    alert("You need to complete the Post Code field");
	form.postcode.focus();
    return false;
  }
  
  if (form.telephone.value == "") {
    alert("You need to complete the Telephone Number");
	form.telephone.focus();
    return false;
  }
  
  if (form.enquiry.value == "") {
    alert("You need to complete the Enquiry field");
	form.enquiry.focus();
    return false;
  }
  
  
  return true ;
}



function echeck(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("Invalid E-mail ID");
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID");
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID");
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID");
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID");
		    return false
		 }

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

 		 return true					
}