if (document.images) {
    menu = new Array();

    menu[0]="pics/header/header_7.gif";
    menu[2]="pics/header/header_9.gif";
    menu[4]="pics/header/header_11.gif";
    menu[6]="pics/header/header_14.gif";
    
    menu[1]="pics/header/header_7_over.gif";
    menu[3]="pics/header/header_9_over.gif";
    menu[5]="pics/header/header_11_over.gif";
    menu[7]="pics/header/header_14_over.gif";
    
    
    im = new Array();
    for (var i = 0; i <= menu.length; i++) {
        im[i] = new Image();
        im[i].src = menu[i]; 
    }
  
}

function toggle(imgName,num) {
    if (document.images) {
        imgName.src = im[num].src 
    }
}