var timerlen = 3;
var slideAniLen;

var isIE6 = navigator.userAgent.indexOf('MSIE 6') != -1;
var isIE7 = navigator.userAgent.indexOf('MSIE 7') != -1;
var isFF = navigator.userAgent.indexOf("Firefox")!=-1;
var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var begHeight = new Array();
var moving = new Array();
var dir = new Array();

function toggleSlide(objname,dropTimer){
		slideAniLen = dropTimer;
        if(moving[objname])
                return;
		if(document.getElementById(objname).style.display != "none"){
			slideup(objname);
			return;
		}
		if(document.getElementById(objname).style.display == "none"){
			slidedown(objname);
			return;
		}
} 

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);
		if(isFF){
			obj[objname].firstChild.nextSibling.style.overflow="hidden";
		}
		if(begHeight[objname]){
			obj[objname].style.height=begHeight[objname];
		}
		if(isIE6 || isIE7){
			endHeight[objname] = parseInt(obj[objname].style.height)-4;
		}else{
			endHeight[objname] = parseInt(obj[objname].style.height);
		}
		begHeight[objname] = parseInt(obj[objname].style.height);

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

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

        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";
				
        }

        return;
}

function endSlide(objname){
        clearInterval(timerID[objname]);

        if(dir[objname] == "up"){
                obj[objname].style.display = "none";
				}
		if(isFF){
			obj[objname].firstChild.nextSibling.style.overflow="auto";
		}
		
		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;
}