var timerlen = 1;
var slideAniLen = 100;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();

function slidedown(objname){
        if(moving[objname])
                return;
        if(document.getElementById(objname).style.display != "none")
                return; // cannot slide down something that is already visible
        moving[objname] = true;
        dir[objname] = "down";
        startslide(objname);
}

function slideup(objname){
        if(moving[objname])
                return;
        if(document.getElementById(objname).style.display == "none")
                return; // cannot slide up something that is already hidden
        moving[objname] = true;
        dir[objname] = "up";
        startslide(objname);
}

function startslide(objname){
        obj[objname] = document.getElementById(objname);
        endHeight[objname] = parseInt(obj[objname].style.height);
        startTime[objname] = (new Date()).getTime();

        if(dir[objname] == "down"){
                //obj[objname].style.height = "1px";
				obj[objname].style.height = "1%";
        }

		obj[objname].style.display = "block";
        timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}

function slidetick(objname){
        var elapsed = (new Date()).getTime() - startTime[objname];
        if (elapsed > slideAniLen)
                endSlide(objname)
        else {
                var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
                if(dir[objname] == "up")
                        d = endHeight[objname] - d;
                //obj[objname].style.height = d + "px";
				obj[objname].style.height = d + "%";
        }
        return;
}

function endSlide(objname){
        clearInterval(timerID[objname]);
        if(dir[objname] == "up")
                obj[objname].style.display = "none";
        //obj[objname].style.height = endHeight[objname] + "px";
		obj[objname].style.height = endHeight[objname] + "%";

        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(endHeight[objname]);
        delete(obj[objname]);
        delete(dir[objname]);
        return;
}

function toggleSlide(objname){
  if(document.getElementById(objname).style.display == "none"){
    // div is hidden, so let's slide down
    slidedown(objname);
	var imagevar = objname + 'img';
	changearrow(imagevar,'http://toptenreviews.com/i/home/downarrow.gif');

  }else{
    // div is not hidden, so slide up
	slideup(objname);
	var imagevar = objname + 'img';
	changearrow(imagevar,'http://toptenreviews.com/i/home/header-arrow.gif');
  }
}

function changearrow(img_name,img_src) {
	document.getElementById(img_name).src=img_src;
}

function toanchor(jumpto) {
        jumppos=document.getElementById(jumpto).offsetTop-30;
        // try both ways as safari wasn't playing nice
        document.body.scrollTop=jumppos;
        document.documentElement.scrollTop=jumppos;
}// JavaScript Document