var timeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;


function mopen(id)
{	
	
	mcancelclosetime();

	
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}

function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}


function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}


function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}


document.onclick = mclose;


function swapPic() {
    if (document.getElementById) {
        var thePicture = document.getElementById("mainimg");
        var picPath = "images/pic" + rnd(3) + ".jpg";
        thePicture.style.background = "url(" + picPath + ")";
    }
}

function rnd(n) {
    return Math.floor(Math.random() * n) + 1;
}