try { 
document.execCommand('BackgroundImageCache', false, true); 
} catch(e) {}

function preload(imgs){
 for(var i = 0; i < imgs.length; i++){
   var imgObj = new Image();
   imgObj.src = imgs[i];
 }
}
preload(["../images/nav03_01hover.png", "../images/nav03_02hover.png", "../images/nav03_03hover.png", "../images/nav03_04hover.png", "../images/nav03_05hover.png", "../images/nav03_02_01hover.png", "../images/nav03_02_02hover.png", "../images/nav03_02_03hover.png", "../images/nav05_01hover.png", "../images/nav05_02hover.png", "../images/nav05_03hover.png", "../images/nav05_04hover.png", "../images/nav06_01hover.png", "../images/nav06_02hover.png"]);