var timerlen = 2;
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();
var inners = new Array();
var wholehgt = 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);
        
        opacity(objname, 0, 100, 300);
}

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);
        opacity(objname, 100, 0, 300);
}

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

		obj[objname].style.display = "block";		// so that we can grab the scrollHeight. else returns NaN
       	if (document.getElementById(objname).style.width == '') { document.getElementById(objname).style.width = obj[objname].scrollWidth+'px';  }

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

        if (inners[objname] !== 'true') { 
        	wholehgt[objname] = parseInt(obj[objname].scrollHeight);
        	endHeight[objname] = wholehgt[objname];
        	
	        var inn_wid = obj[objname].scrollWidth;
        	inners[objname] = "true"; 

        	obj[objname].style.position = 'relative';
        	obj[objname].style.overflow = 'hidden';

        	var new_str = '<div id="' + objname + '_inners" style="position:absolute; bottom:0; margin:0; padding:0; width:' + inn_wid + 'px;">' + obj[objname].innerHTML + '</div>';
        	obj[objname].innerHTML = new_str;
        } else {
        	document.getElementById(objname+"_inners").style.position = "absolute";
        	document.getElementById(objname).style.overflow = "hidden";
        }

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

        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 = '';


		document.getElementById(objname+"_inners").style.position = "relative";
        document.getElementById(objname).style.overflow = "visible";
        document.getElementById(objname).style.height = "";


        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);
  }else{
    // div is not hidden, so slide up
    slideup(objname);
  }
}