var aryImages = new Array();
aryImages[0] = "../../images/button_home_ro.jpg";
aryImages[1] = "../../images/button_nexttip_ro.jpg";
aryImages[2] = "../../images/button_back_ro.jpg";
aryImages[3] = "../../images/button_a_ro.jpg";
aryImages[4] = "../../images/button_b_ro.jpg";
aryImages[5] = "../../images/button_c_ro.jpg";
aryImages[6] = "../../images/button_d_ro.jpg";

for (i=0; i < aryImages.length; i++) 
{
    var preload = new Image();
    preload.src = aryImages[i];
}