function controlprix()
{



if(document.contactmail.societe.value == "") 
 {
   alert("Please enter your Company Name.");
   document.contactmail.societe.focus();
   return false;
  }
  

if(document.contactmail.nom.value == "") 
 {
   alert("Please enter your Last Name and First Name.");
   document.contactmail.nom.focus();
   return false;
  }


  
  if(document.contactmail.mail.value == "")  
 {
   alert("Please enter your E-mail!");
   document.contactmail.mail.focus();
   return false;
  }
 
 
if(document.contactmail.mail.value.indexOf('@') == -1)  
 {
   alert("Please enter valid E-mail.");
   document.contactmail.mail.focus();
   return false;
  }
  
 
}