function newImage( imgSrc ){

 var imgName = new Image();
 imgName.src = imgSrc;

 return imgName;

}

function change( imgName, imgLocation )
{
 document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {
 header_index_orange_01 = newImage("images/header_index_orange_01.gif");
 header_index_orange_02 = newImage("images/header_index_orange_02.gif");
  header_index_orange_03 = newImage("images/header_index_orange_03.gif");
  header_index_orange_04 = newImage("images/header_index_orange_04.gif");
  header_index_orange_05 = newImage("images/header_index_orange_05.gif");
 header_index_orange_06 = newImage("images/header_index_orange_06.gif");
 header_index_orange_07 = newImage("images/header_index_orange_07.gif");
 preloadFlag = true;
 }
}