var as='canoe';
function imgPreload() {
    var d=document;
    if(d.images) {
        if(!d.p) d.p=new Array();
        var i, j=d.p.length, a=imgPreload.arguments;
        for(i=0; i<a.length; i++) if(a[i].indexOf("#")!=0) {
            d.p[j]=new Image;
	    d.p[j++].src=a[i];
	}
    }
}
function imgSwap(n, s) {
    var x = document.images[n];
    if(!x) { alert("cannot find image "+n); return; }
    if(!x.oSrc) x.oSrc = x.src;
    x.src=s;
}
function imgRestore(n) {
    var i=document.images;
    if(n) {
        if(i[n].oSrc) i[n].src = i[n].oSrc;
    } else {
        for(var j=0; j<i.length; j++) if(i[j].oSrc) i[j].src=i[j].oSrc;
    }
}
function setOpacity(id, value) {
    var object = document.getElementById(id);
    object.style.opacity = value/10;
    object.style.filter = 'alpha(opacity='+(value*10)+')';
}
function activateSect(s, d) {
    if(s != as) {
        imgSwap(as+'button', d+as+'-button.png');
        imgSwap('mainpic', d+s+'.jpg');
        imgSwap('prevpic', d+s+'-p.jpg');
        imgSwap('nextpic', d+s+'-n.jpg');
        imgSwap(s+'button', d+s+'-button-x.png');
        as = s;
    }
}