function highlight (menu) {
	changeOpac (100, menu);
}

function darken (menu) {
	blendimage (menu, 500);
}

function changeOpac(opacity, id) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
}

function blendimage(imageid, millisec) { 
    var speed = Math.round(millisec / 100); 
    var timer = 0; 
     
    //set the current image as background 
//    document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")"; 
     
    //make image transparent 
//    changeOpac(0, imageid); 
     
    //make new image 
//    document.getElementById(imageid).src = imagefile; 

    //fade in image 
    for(i = 100; i > 0; i--) { 
        setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed)); 
        timer++; 
    } 
}