var links = ["weddings", "casual", "info", "blog", "clients"];
var linksunderline = new Array(links.length);
var linksplain = new Array(links.length);

function prelinks(up)
{
    var upstr = "";
    while(up-- > 0) {
        upstr += "../";
    }
    for (i = 0; i < links.length; i++) {
        linksunderline[i] = new Image();
        linksunderline[i].src = upstr+"images/"+links[i]+"_u.jpg";
        linksplain[i] = new Image();
        linksplain[i].src = upstr+"images/"+links[i]+".jpg";
    }
}

function linkson(id)
{
    var ele = document.getElementById(links[id]);
    ele.src = linksunderline[id].src;
}

function linksoff(id)
{
    var ele = document.getElementById(links[id]);
    ele.src = linksplain[id].src;
}