var timerlen = 5;
var slideAniLen = 250;

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")
		if(document.getElementById(objname).style.visibility != "hidden"){
                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")
		if(document.getElementById(objname).style.visibility == "hidden"){
                return; // cannot slide up something that is already hidden
		}
        moving[objname] = true;
        dir[objname] = "up";
        startslide2(objname);
}

function startslide(objname){
        obj[objname] = document.getElementById(objname);
		
		var dimensions = $(objname + "menu").getDimensions(); 

		endHeight[objname] = dimensions.height;
        startTime[objname] = (new Date()).getTime();

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

        //obj[objname].style.display = "block";
		obj[objname].style.visibility = "visible";

        timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
		
}

function startslide2(objname){
        obj[objname] = document.getElementById(objname);
		
		var dimensions = $(objname).getDimensions(); 
		//alert(dimensions.height);
		endHeight[objname] = dimensions.height;
        startTime[objname] = (new Date()).getTime();

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

        //obj[objname].style.display = "block";
		obj[objname].style.visibility = "visible";

        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;
				
				if (d > 0) {
                obj[objname].style.height = d + "px";
				}
        }

        return;
}

function endSlide(objname){
  	clearInterval(timerID[objname]);
	 
  	if(dir[objname] == "up"){
    	//obj[objname].style.display = "none";
		obj[objname].style.visibility = "hidden";
	}
	
 	//var dimensions = $(objname + "menu").getDimensions(); 
  	obj[objname].style.height = endHeight[objname] + "px";
 
  	delete(moving[objname]);
  	delete(timerID[objname]);
  	delete(startTime[objname]);
  	delete(endHeight[objname]);
  	delete(obj[objname]);
  	delete(dir[objname]);
 
  	return;
}