// ------------------------------------------------------------------------------------
// Author: Harry Maugans @ http://www.harrymaugans.com/
// Modified by Daniel Li on 05/18/2007, added Horizontal Slide
// ------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------
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();
var endWidth = new Array();

function slidedown(objname, type){
        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, type);
}

function slideup(objname, type){
        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, type);
}

function slideleft(objname, type){
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display == "none")
                return; // cannot slide left something that is already hidden

        moving[objname] = true;
        dir[objname] = "left";
        startslide(objname, type);
}

function slideright(objname, type){
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display != "none")
                return; // cannot slide right something that is already visible

        moving[objname] = true;
        dir[objname] = "right";
        startslide(objname, type);
}

function startslide(objname, type){
        obj[objname] = document.getElementById(objname);
		
		if(dir[objname] == "right" || dir[objname] == "left"){
			endWidth[objname] = parseInt(obj[objname].style.width);
			if(dir[objname] == "right"){obj[objname].style.width = "1px";}
		}
		else {
			endHeight[objname] = parseInt(obj[objname].style.height);
			if(dir[objname] == "down"){obj[objname].style.height = "1px";}
		}
        startTime[objname] = (new Date()).getTime();
        obj[objname].style.display = "block";
        timerID[objname] = setInterval('slidetick(\'' + objname + '\', \''+type+'\');',timerlen);
}

function slidetick(objname, type){
        var elapsed = (new Date()).getTime() - startTime[objname];
        if (elapsed > slideAniLen){endSlide(objname, type);}
        else {
			var d; 
            if(dir[objname] == "right" || dir[objname] == "left") {
				d =Math.round(elapsed / slideAniLen * endWidth[objname]);
				if(dir[objname] == "left") {d = endWidth[objname] - d;}
				obj[objname].style.width = d + "px";
			}
            else {
				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, type){
        clearInterval(timerID[objname]);

        if(dir[objname] == "left" || dir[objname] == "up"){obj[objname].style.display = "none";}
		if(dir[objname] == "right" || dir[objname] == "left"){obj[objname].style.width = endWidth[objname] + "px";}
		else {obj[objname].style.height = endHeight[objname] + "px";}

        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(endWidth[objname]);
        delete(endHeight[objname]); 
        delete(obj[objname]);
        delete(dir[objname]);
		
		if (type=="down") {slidedown(objname);}
		else if (type=="up") {slideup(objname);}
		else if (type=="left") {slideleft(objname);}
		else if (type=="right") {slideright(objname);}
        return;
}