/**********************************************************
 * Cambia la imagen al pasar el raton por encima          *
 **********************************************************/

var fext_normal = '.gif';
var fext_over = '_sobre.gif';
var preloadedImages = new Array();

function preloadImages(){
    with (document){
        l=images.length;
        for( i=0; i < l; i++){
            var img = images[i];
            if(img.onmouseover){
                if (!img.onmouseout) img.onmouseout = mOut;
                var x = preloadedImages.length;
                preloadedImages[x] = new Image();
                preloadedImages[x].src = img.src.replace(fext_normal,fext_over);
            }
        }
    }
}

function mOvr(obj){
    obj.src = obj.src.replace(fext_normal,fext_over);
}

function mOut(){
    this.src = this.src.replace(fext_over,fext_normal);
}