var timerlen = 1;
var slideAniLen = 300;
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 kayanlar = [ 'koseyazisi','puandurumu', 'naklenyayin', 'program', 'forum', 'iletisim' ];

function slidedown(objname,showobj){
        if(moving[objname])
                return;
        moving[objname] = true;
        dir[objname] = "down";
        showhide(showobj);
        startslide(objname);
}

function slideup(objname){
        if(moving[objname])
                return;
        if(document.getElementById(objname).style.display == "none")
                return;
        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 showhide(layeref) {
	for (x=0; x<6; x++) {
		if (x == layeref) {
			showSH(kayanlar[x])
		} else {
			hideSH(kayanlar[x])
		}
	}
}

var whichDom = "", styleObj = ""
var isNav4, isNav6, isIE
var isBrand = navigator.appName
var agt = navigator.userAgent.toLowerCase()
var navVer = parseInt(navigator.appVersion)

isNav4 = (isBrand == "Netscape" && navVer < 5) ? true : false
isNav6 = (isBrand == "Netscape" && navVer >= 5) ? true : false
isIE = ((agt.indexOf("msie") != - 1) && (parseInt(navVer) >= 4)) ? true : false

if(isNav6)  {
  whichDom = '.getElementById("'
  styleObj = '").style'
} else if (isNav4)  {
  whichDom = '["'
  styleObj = '"]'
} else {
  whichDom = ".all."
  styleObj = ".style"
}

function theObjectSH(obj) {
var theObj
    if (typeof obj == "string")
        theObj = eval("document" + whichDom + obj + styleObj)
    else
        theObj = obj
        return theObj
}

function showSH(obj) {
var theObj = theObjectSH(obj)
    theObj.visibility = "visible";
    theObj.display = "block";
    
}

function hideSH(obj) {
var theObj = theObjectSH(obj)
    theObj.visibility = "hidden"
    theObj.display = "none";
}