function checkForm(f) {
      
         if (f.fname.value.length < 1) {
                alert("Please enter first name.");
				f.fname.focus(); 
                return false;
         }

         if (f.lname.value.length < 1) {
                alert("Please enter last name.");
				f.lname.focus(); 
                return false;
         }		 


		if (f.email.value.indexOf("@") + "" == "-1" || f.email.value.indexOf(".") + "" == "-1" || f.email.value == "" )
		 { 
			alert("Please enter email address in correct format.");
			f.email.focus();
			return false;
		 }

         if (f.code.value.length < 1) {
                alert("Please enter code.");
				f.code.focus(); 
                return false;
         }
}