function  checkfields() 
{
   c_name=document.form_contact.name.value;
  address=document.form_contact.address.value;
  email=document.form_contact.mail.value;
  phone=document.form_contact.phone.value;
   comment=document.form_contact.comment.value;
  
   if(c_name=="")
   {
    alert("Please Enter Name");
    return false;
   }
   
    if(address=="")
   {
    alert("Please Enter Address");
    return false;
   }
   
    if(email=="")
   {
    alert("Please Enter Email id.");
    return false;
   }
   
	if( document.form_contact.mail.value != "" ){
	   if((document.form_contact.mail.value.indexOf('@') == -1) || (document.form_contact.mail.value.indexOf('.') == -1))
		 {
		   alert("Enter Valid Email Address");
			document.form_contact.mail.value="";
				document.form_contact.mail.focus();
				return false;      
			}
		}
  

    if(phone=="")
   {
    alert("Please Enter Phone Number");
    return false;
   }

	 if (document.form_contact.phone.value != "")
 	{
	   landline_value=document.form_contact.phone.value;
        var i;
		 for (i = 0; i < landline_value.length; i++)
		 {
			 // Check that current character is number.
			 var c = landline_value.charAt(i);
			 if (((c < "0") || (c > "9")))
			 {
			   alert("Please enter only numeric values for phone number!");
			   return false;
			 }
		 }

	}
	
	if(comment=="")
   {
    alert("Please enter the query");
    return false;
   }
	
	
			

}