var timerlen = 5;
var slideAniLen = 550;

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){
        if(moving[objname])
                return;

        if(document.getElementById(tabcontent+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(tabcontent+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(tabcontent+objname);

        endHeight[objname] = parseInt(tabheight[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){
        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;
}


var oldid = 1;
var tabheight = new Array();
var classname = "tab_headings";
var oldclassname = "";
var tabheader = "product-details-tab-header-";
var tabcontent = "product-details-tab-content-";
function changeTab(no, idname) {

	if (no != oldid) {
		document.getElementById(tabheader+no).className = classname + " " + idname + " " + idname + "-selected";
		document.getElementById(tabheader+oldid).className = classname + " " + oldclassname;
		oldclassname = idname;

		slidedown(no);
		slideup(oldid);

		oldid = no;
	}
}


function updateTabHeight(tot) {
	for (var i=1; i<=tot; i++) {
		if (document.getElementById(tabcontent+i)){
			var height = document.getElementById(tabcontent+i).offsetHeight;
			tabheight[i] = height;
			if (i == 1) {
				document.getElementById(tabcontent+i).style.display = 'block';
			} else {
				document.getElementById(tabcontent+i).style.display = 'none';
			}
			document.getElementById(tabcontent+i).style.overflow = 'hidden';
		}
	}
}


function updateClassname(classname) {
	oldclassname = classname;
}