var opac = new Array(80,80,80,80);
var pict = new Array('al1','al2','al3','al4');
var tt = new Array();
var tt2 = new Array();


function light(q) {
opac[q]+=5;
document.getElementById(pict[q]).style.filter="alpha(opacity="+opac[q]+")";
tt[q] = setTimeout("light("+q+")",150);
if (opac[q]==100) clearTimeout(tt[q]);
};

function unlight(q) {
if (opac[q]!=80) opac[q]-=5;
document.getElementById(pict[q]).style.filter="alpha(opacity="+opac[q]+")";
tt2[q] = setTimeout("unlight("+q+")",50);
if (opac[q]==100) clearTimeout(tt2[q]);
};

show = function(id) {
    var qq = document.getElementById(id);
    if(qq.style.display == 'block' || qq.style.display == '') { 
        qq.style.display = 'none';
    }
    else { 
        qq.style.display = 'block';
    }
    
}

hide = function(id) {
    var u = document.getElementById(id);
    if(u.style.display == 'block') { 
        u.style.display = 'none';
    }
    
}