function doLoad() {
  img01 = new Image; img01.src = "graphics/index_ovr_1.jpg";
  img02 = new Image; img02.src = "graphics/index_ovr_2.jpg";
}

function move_in(img_name,img_src) {
 document[img_name].src=img_src
}

function move_out(img_name,img_src) {
 document[img_name].src=img_src
}

function showwin(thePage) {
  var w=window.open(thePage,'bookingwin','toolbar=no, menubar=no, resizable=no, width=600 height=450','false');
  var d=w.document;
}

function doCheckFields() {
  var f = document.contactform;
  var errMsg = '';
  var newLine = '';
    if (f.Name.value == '') {
      errMsg = 'Name is a required field.';
      newLine = '\n';
    }
    if ( (f.Phone.value == '') && (f.Email.value == '') ) {
      errMsg = errMsg + newLine + 'Either Phone or Email is a required field.';
    }
    
    if (errMsg == '') {
      return true;
    }
    else {
      alert(errMsg);
      return false;
    }
}