//Source from http://www.harrymaugans.com/ - Modifications by Luke Robinson.

var timerlen = 5;
var slideAniLen = 500;

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){
	
		 var browserName=navigator.appName; 
		 var m = document.getElementById(objname).parentNode; //swap the arrow images
		 
		  if (browserName=="Microsoft Internet Explorer"){
			  m.firstChild.style.backgroundImage = 'url(images/bullets/work_arrow_down.png)';		  
		  }else{
			  m.firstChild.nextSibling.style.backgroundImage = 'url(images/bullets/work_arrow_down.png)';
		  };
		 
        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){
	
		 var browserName=navigator.appName; 
		 var m = document.getElementById(objname).parentNode; //swap the arrow images
		 
		  if (browserName=="Microsoft Internet Explorer"){
			  m.firstChild.style.backgroundImage = 'url(images/bullets/work_arrow.png)';		  
		  }else{
			  m.firstChild.nextSibling.style.backgroundImage = 'url(images/bullets/work_arrow.png)';
		  };
		  
        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);

        endHeight[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";

        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;
}

function toggleSlide(objname){
	
	var x=document.getElementById("workshowcase").getElementsByTagName("div");
	
	for (var i=0;i<(x.length/3);i++) //divide by the number of 'Divs' inside the list item.
	{	
	 var work = ("work_"+(i + 1));
		 if(work != objname)
		 slideup(work); 
	};
	
    slidedown(objname);
	
}