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();

function slidedown(objname){
	//var divObjTester = document.getElementById('stage1_ex'); // added by Joe
    //alert('Trying to slide down'); // added by Joe
		//alert('Display of stage1_ex is set to ' + divObjTester.style.display); // added by Joe
		/*divObjTester.style.display = "none"; //set to none in stylesheet, but doesn't show "none" until set programmatically wtf?
		alert('Display of stage1_ex is set to ' + divObjTester.style.display); // added by Joe*/

		// WHAT WE LEARNED
		// Object.style.display is null if display:none set as class
		// Object.style.display is "none" if display:none set as inline style

        if(moving[objname]) {
				alert('Sorry, div is moving.'); // added by Joe
                return;}

        if(document.getElementById(objname).style.display != "none") {
				alert('Sorry, div is visible so no slide'); // added by Joe
                return;} // cannot slide down something that is already visible

        //alert('Made it past the conditionals'); // added by Joe
		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);
		
		//alert('objname is currently ' + objname);
        endHeight[objname] = parseInt(obj[objname].style.height);
        
		//alert('endHeight for the div is seen as ' + endHeight[objname]);
        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){
		//var otherDiv = objname.substr(0,6);
		//alert('The other Div is ' + otherDiv);
        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;
}