var timerlen = 5;
var slideAniLen = 350;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var endTop = new Array();
var moving = new Array();
var dir = new Array();


function switch_hide(id) {
    var doc = document.getElementById(id);
    if (doc) {
        if (doc.style.display=="block") {
            doc.style.display="none";
        }else{
            doc.style.display="block";
        }
    }
}

function slidedown(objname){
        if(moving[objname])
                return;

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

        moving[objname] = true;
        dir[objname] = "down";
		endTop[objname] = parseInt(document.getElementById(objname).style.top);
        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
		 if(document.getElementById(objname).style.visibility == "hidden")
                return; // cannot slide down something that is already visible

        moving[objname] = true;
        dir[objname] = "up";
        startslide(objname);
}

function startslide(objname){
		//alert(endTop[objname]+"xxx");
        obj[objname] = document.getElementById(objname);

        endHeight[objname] = parseInt(obj[objname].style.height);
		//endTop[objname] = parseInt(obj[objname].style.top);
        startTime[objname] = (new Date()).getTime();

        if(dir[objname] == "down"){
                //obj[objname].style.height = "1px";
				obj[objname].style.opacity = "0";
        }

        //obj[objname].style.display = "block";
		obj[objname].style.visibility = "visible";

        timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}

function slidetick(objname){
        var elapsed = (new Date()).getTime() - startTime[objname];
		var dif=0;
        if (elapsed > slideAniLen)
                endSlide(objname)
        else {
                var d =Math.round(elapsed / slideAniLen * 100);
				//var t =Math.round(elapsed / slideAniLen * endTop[objname]);
                 if(dir[objname] == "up") {
                        // d = endHeight[objname] - d;
						//t = endTop[objname] - t;
						d = 100 - d;
						 }
				obj[objname].style.opacity = d/100;
				obj[objname].style.filter = 'alpha(opacity=' + d + ')';
                // obj[objname].style.height = d + "px";
				// dif = endTop[objname]-d;
				// obj[objname].style.top = dif +"px";
				
        }

        return;
}

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

        if(dir[objname] == "up") {
                //obj[objname].style.display = "none";
				obj[objname].style.visibility = "hidden";
				//obj[objname].style.top = endTop[objname] + "px";
				//obj[objname].style.top = endTop[objname] + "px";
				obj[objname].style.opacity = 0;
				obj[objname].style.filter = 'alpha(opacity=' + 0 + ')';
				delete(endTop[objname]);
				}
				else{
					//obj[objname].style.top = (endTop[objname]-endHeight[objname]) + "px";
					obj[objname].style.opacity = 1;
					obj[objname].style.filter = 'alpha(opacity=' + 100 + ')';
				}		

        //obj[objname].style.height = endHeight[objname] + "px";
		
		
		

        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(endHeight[objname]);
		//delete(endTop[objname]);
        //delete(obj[objname]);
        delete(dir[objname]);

        return;
}


function toggleSlide(objname){
	
	//if(document.getElementById(objname).style.display == "none"){
	if(document.getElementById(objname).style.visibility == "hidden"){
		// div is hidden, so let's slide down
		//endTop[objname] = document.getElementById(objname).style.top;
		slidedown(objname);
	}else{
		// div is not hidden, so slide up
		slideup(objname);
		//alert('END:'+endTop[objname]);
	}
}