function ValidateForm(f){

      with(f){
         if (isEmpty(_1_Name.value)) {
            alert("Please enter your Name");
            _1_Name.focus();
            return false;
         }

         if (isEmpty(_2_Email_From.value)) {
            alert("Please enter your Email Address");
            _2_Email_From.focus();
            return false;
         }

         if ( !isEmail(_2_Email_From.value) ) {
            alert("Please enter a valid Email Address.");
            _2_Email_From.focus();
            return false;
         }

         if (!isEmpty(_3_Phone.value)) {
	         if (!IsNumber(_3_Phone.value, true)) {
            	alert("Please enter only numbers for your Phone");
            	_3_Phone.focus();
            	return false;
         	}
         }
         if (!isEmpty(_4_Fax.value)) {
         if (!IsNumber(_4_Fax.value, true)) {
            	alert("Please enter only numbers for your Fax");
            	_4_Fax.focus();
            	return false;
         	}
         }
         if (isEmpty(_5_Enquiries.value)) {
            alert("Please enter your Enquiry");
            _5_Enquiries.focus();
            return false;
         }
   	}
   return true;
 }