function control()
{

if(document.contactmail.renseignement.value == "") 
 {
   alert("Please enter the details for your enquiry. ");
   document.contactmail.renseignement.focus();
   return false;
  }

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.");
   document.contactmail.nom.focus();
   return false;
  }


if(document.contactmail.prenom.value == "") 
 {
   alert("Please enter your First Name.");
   document.contactmail.prenom.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;
  }
  
if(document.contactmail.tel.value == "")  
 {
   alert("Please enter your phone number.");
   document.contactmail.tel.focus();
   return false;
  }
  
   
  {
var p = 1;
 	for(j=0;j<document.contactmail.tel.value.length;++j)
 
   if(document.contactmail.tel.value.charAt(j) < "0" || document.contactmail.tel.value.charAt(j) > "9")
     p = -1;
	 
 if(p == -1) 
 {
   alert("Please enter valid phone number.");
   document.contactmail.tel.focus();
   return false;
 }
}

}