var timerlen = 5;
var slideAniLen = 250;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var startHeight = new Array();
var targetHeight = 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";
		startHeight[objname] = 180;
		targetHeight[objname] = 370;
        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";
		startHeight[objname] = 370;
		targetHeight[objname] = 180;
        startslide(objname);
}

function startslide(objname){
        obj[objname] = document.getElementById(objname);

       // endHeight[objname] = parseInt(obj[objname].style.height);
		//endHeight[objname] = targetHeight[objname];
        startTime[objname] = (new Date()).getTime();

        if(dir[objname] == "down"){
                obj[objname].style.height = "180px";
        }else{
			 obj[objname].style.height = "370px";
		}

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

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

function slidetick(objname){
        var elapsed = (new Date()).getTime() - startTime[objname];
//alert(endHeight[objname]);
        if (elapsed > slideAniLen)
                endSlide(objname)
        else {
               var d = 0; 
                if(dir[objname] == "up"){
					//contracting
				//d =Math.round(elapsed / slideAniLen * (targetHeight[objname] - startHeight[objname]));
                //d = targetHeight[objname] + startHeight[objname] - d;
				d = targetHeight[objname];
				}else{
					//expanding
				//d =Math.round(elapsed / slideAniLen * targetHeight[objname]);
				//d = startHeight[objname] + d;	
				d = targetHeight[objname];
				}

                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.height = targetHeight[objname] + "px";

        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(startHeight[objname]);
		delete(targetHeight[objname]);
        delete(obj[objname]);
        delete(dir[objname]);

        return;
}