function checkRequiredFieldSellerFirst()
	 {
	 
	     
		 
		 
		 
		 	if(document.getElementById("first_name").value == "")
			 {
			   document.getElementById("first_name").focus();		
			   alert("Required field first name ");	 
			   return false;
			 }
			 
			 
			 if(document.getElementById("telephone").value == "")
			 {
			   document.getElementById("telephone").focus();		
			   alert("Required field telephone");	 
			   return false;
			 }


		  if(document.getElementById("telephone").value == "")
			 {
			   document.getElementById("telephone").focus();		
			   alert("Required field telephone");	 
			   return false;
			 }
		
			 if(document.getElementById("mobile").value == "")
			 {
			   document.getElementById("mobile").focus();		
			   alert("Required field mobile ");	 
			   return false;
			 }
			 
			 var email = document.getElementById("email");
			
			  if(isEMailAddr(email) ==false)
				{
				   email.focus();
				   return false;
				}
	        
			if(document.getElementById("confirm_email").value == "")
			 {
			   document.getElementById("confirm_email").focus();		 
			   alert("Required field confirm email ");	 
			   return false;
			 }
			 
			   var confirm_email = document.getElementById("confirm_email");
			 	if(isEMailAddr(confirm_email) ==false)
				{
				   confirm_email.focus();
				   return false;
				}
			 
			 if(document.getElementById("email").value !=document.getElementById("confirm_email").value)
			 {
			   alert("email and confirm email is not matching");	 
			   return false;
			 }
			 
			
			 
			 
			if(document.getElementById("house_number").value == "")
			 {
			   document.getElementById("house_number").focus();		 
			   alert("Required field house number ");	 
			   return false;
			 }
			 
			 
			 
			 if(document.getElementById("street_road").value == "")
			 {
			   document.getElementById("street_road").focus();		 
			   alert("Required field street road");	 
			   return false;
			 }
			 
			 
			 
			 if(document.getElementById("town_city").value == "")
			 {
			   document.getElementById("town_city").focus();		 
			   alert("Required field town");	 
			   return false;
			 }
			 
			 
			 
			 if(document.getElementById("district").value == "")
			 {
			   document.getElementById("district").focus();		 
			   alert("Required field district/city ");	 
			   return false;
			 }
			 
		
			 
			 
			 
			 if(document.getElementById("county").value == "")
			 {
			   document.getElementById("county").focus();		 
			   alert("Required field county ");	 
			   return false;
			 }
			 
			  if(document.getElementById("post_code").value == "")
			 {
			   document.getElementById("post_code").focus();		 
			   alert("Required field post code ");	 
			   return false;
			 }
			 
			 
			 
			 
		    return true;
	 }

function isEMailAddr(elem)
 {
    var str = elem.value;
    var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
    if (!str.match(re)) 
	{
        alert("Verify the e-mail address format.");
        
        return false;
    } 
	else 
	{
        return true;
    }
}