function validate(form_id,email,fname,lname,phone) 
{

   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var check = 1;
   var address = document.forms[form_id].elements[email].value;
   var firstname  = document.forms[form_id].elements[fname].value;
   var lastname  = document.forms[form_id].elements[lname].value;
   var phonenumber  = document.forms[form_id].elements[phone].value;
   var elem1 = document.getElementById("emailstyle");
   var elem2 = document.getElementById("fnamestyle");
   var elem3 = document.getElementById("lnamestyle");
   var elem4 = document.getElementById("phonestyle");
   
	elem1.style.display='none';
	elem2.style.display='none';
	elem3.style.display='none';
	elem4.style.display='none';

 if(reg.test(address) == false) 
   {
	  check = 0;
	  elem1.style.display = 'block';

   }
   if(firstname == "")
   {
	  check = 0; 
	  elem2.style.display = 'block';	  

   }
   if(lastname == "")   
   {
	  check = 0;   
	  elem3.style.display = 'block';	  

   }
   if(phonenumber == "")   
   {
	  check = 0;   
	  elem4.style.display = 'block';	  

   }
   
   if(check)
	return true;
   else
	return false;
   
}