function preloadImages() 
{
    if (document.images) {
        imgsrc = new Array(
            "pix/titul/istorija_2.gif",
            "pix/titul/parapija_2.gif",
            "pix/titul/sakramentai_2.gif",
            "pix/titul/aktualijos_2.gif"           
        )

        imglist = new Array() ;

        for (counter in imgsrc) {
            imglist[counter] = new Image() ;
            imglist[counter].src = imgsrc[counter] ;
        }
    }
}

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