function ValidateForm(f){

      with(f){
         if (isEmpty(_10_Name.value)) {
            alert("Please enter your Name");
            _10_Name.focus();
            return false;
         }

         if (isEmpty(_15_Email_From.value)) {
            alert("Please enter your Email Address");
            _15_Email_From.focus();
            return false;
         }

         if ( !isEmail(_15_Email_From.value) ) {
            alert("Please enter a valid Email Address.");
            _15_Email_From.focus();
            return false;
         }
		 
		 if (isEmpty(_20_Phone.value)) {
            alert("Please enter your Phone number");
            _20_Phone.focus();
            return false;
         }
		 
		if (isEmpty(_25_Comments.value)) {
            alert("Please enter your query in the comments field");
            _25_Comments.focus();
            return false;
         }
       
   	}
   return true;
 }