function validate()
   {
    
	 if(document.contact_us.fname.value=="")
	{
		alert("Please enter your name");
		document.contact_us.fname.focus();
		return false;
		
	 }
	 var checkString = document.contact_us.fname.value;
	 if (checkString != "") {
		
  /*  if ( /[^A-Za-z\d]/.test(checkString)) {
        alert("Please enter only letter and numeric characters");
        document.contact_us.fname.focus();
        return (false);
    }
*/
		
		}
	 	 	 
	 if(document.contact_us.email.value=="")
	{
		alert("Please specify your email address");
		document.contact_us.email.focus();
       	return false;
	 }

	 if(document.contact_us.email.value!="")
	{
	   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	   var address = document.contact_us.email.value;
   if(reg.test(address) == false) {
      alert('Invalid email address');
	  document.contact_us.email.focus();
      return false;
	}
}
   }