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

addtocart = new Image();
addtocart.src = "images/add-to-cart-button-on.gif";
moredetails = new Image();
moredetails.src = "images/more-details-button-on.gif";

function addHeader(text) {
    if( self == top ) {
        var detailsWrap = document.getElementById('detailsWrap');
        var detailsContent = document.getElementById('detailsContent');
        var headerForDetails = document.createElement('h1');
        var headerText = document.createTextNode(text);
        headerForDetails.appendChild(headerText);
        detailsWrap.insertBefore(headerForDetails,detailsContent);
    }
}