function MM_preloadImages() 
{
    var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

var prevImg = null;

function MM_swapImage(id) 
{
    if (prevImg)
    {
        prevImg.src = '/images/menu_square.gif';
    }
    var curImg = document.getElementById(id);
    if (curImg)
    {
	curImg.src = '/images/menu_square_over.gif';
	prevImg = curImg;
    }
    else
    {
	prevImg = null;
    }
}