function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

<!-- For rollovers
image1= new Image( );
image1.src="/HEADER_Images/HEADER_ProductsON.png";
image2= new Image( );
image2.src="/HEADER_Images/HEADER_ProductsOFF.png";

image3= new Image( );
image3.src="/HEADER_Images/HEADER_GalleryON.png";
image4= new Image( );
image4.src="/HEADER_Images/HEADER_GalleryOFF.png";

image5= new Image( );
image5.src="/HEADER_Images/HEADER_InstallationON.png";
image6= new Image( );
image6.src="/HEADER_Images/HEADER_InstallationOFF.png";

image7= new Image( );
image7.src="/HEADER_Images/HEADER_ToolsON.png";
image8= new Image( );
image8.src="/HEADER_Images/HEADER_ToolsOFF.png";

image7= new Image( );
image7.src="/HEADER_Images/HEADER_CustomON.png";
image8= new Image( );
image8.src="/HEADER_Images/HEADER_CustomOFF.png";

image9= new Image( );
image9.src="/HEADER_Images/HEADER_SpecialsON.png";
image10= new Image( );
image10.src="/HEADER_Images/HEADER_SpecialsOFF.png";

image11= new Image( );
image11.src="/HEADER_Images/HEADER_SignInON.png";
image12= new Image( );
image12.src="/HEADER_Images/HEADER_SignInOFF.png";

image11= new Image( );
image11.src="/HEADER_Images/HEADER_ShopON.png";
image12= new Image( );
image12.src="/HEADER_Images/HEADER_ShopOFF.png";

//-->