function ddpanel(setting)
{setting.dir="up" //initial state of panel (up="contracted")
if (setting.stateconfig.persiststate && ddpanel.getCookie(setting.ids[0])=="down"){
setting.dir="down"}

if (setting.dir=="up"){ //if "up", output CSS to hide panel contents
document.write('<style type="text/css">\n')
document.write('#'+setting.ids[1]+'{height:' + parseInt(setting.stateconfig.initial) + 'px; overflow:hidden}\n')
document.write('</style>\n')}

setting.stateconfig.initial=parseInt(setting.stateconfig.initial)
this.setting=setting

if (setting.pointerimage.enabled){ //preload images
var img1=new Image(), img2=new Image()
img1.src=setting.pointerimage.src[0]
img2.src=setting.pointerimage.src[1]}
 
var thispanel=this
if (window.addEventListener) //if non IE browsers, initialize panel window.onload
ddpanel.addEvent(window, function(e){thispanel.initpanel(setting)}, "load")
else //else if IE, add 100 millisec after window.onload before initializing
ddpanel.addEvent(window, function(e){setTimeout(function(){thispanel.initpanel(setting)}, 100)}, "load")
ddpanel.addEvent(window, function(e){thispanel.uninit(setting)}, "unload")}

ddpanel.events_array=[] //object array to contain events created by script

ddpanel.addEvent=function(target, functionref, tasktype)
{var evtmodel=target.addEventListener? "w3c" : "ie"
var evtaction=evtmodel=="w3c"? "addEventListener" : "attachEvent"
var i=this.events_array.push({ //store event info in ddpanel.events_array[] and return current event's index within array
target: target,
tasktype: (evtmodel=="ie"? "on" : "")+tasktype,
listener: evtmodel=="ie"? function(){return functionref.call(target, window.event)} : functionref
})-1

target[evtaction](this.events_array[i].tasktype, this.events_array[i].listener, evtmodel=="w3c"? false : null)}

ddpanel.removeEvent=function(target, functionref, tasktype)
{var evtmodel=target.removeEventListener? "w3c" : "ie"
var evtaction=evtmodel=="w3c"? "removeEventListener" : "detachEvent"
target[evtaction](tasktype, functionref, evtmodel=="w3c"? false : null)}

ddpanel.getCookie=function(Name)
{var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
if (document.cookie.match(re)) //if cookie found
return document.cookie.match(re)[0].split("=")[1] //return its value
return null}

ddpanel.setCookie=function(name, value){document.cookie = name+"=" + value + ";path=/"}

ddpanel.addpointer=function(target, className, imagesrc)
{var pointer=document.createElement("img")
pointer.src=imagesrc
pointer.className=className
pointer.style.borderWidth=0
target.appendChild(pointer)
return pointer}

ddpanel.prototype={

togglepanel:function(dir){ //public function that toggles the panel's state. Optional dir parameter ("up" or "down") to explicitly set state.
var setting=this.setting
setting.dir=dir || ((setting.dir=="up")? "down" : "up")
var pcontent=setting.pcontent, dir=setting.dir
pcontent._currentheight=(dir=="down")? pcontent._actualheight : setting.stateconfig.initial
pcontent.style.height=pcontent._currentheight+"px"
if (setting.pointerimage.enabled){
setting.arrow.src=setting.pointerimage.src[(setting.dir=="down")? 1 : 0]
setting.arrow.style.visibility="visible"}
ddpanel.setCookie(setting.ids[0], setting.dir)},

togglepanelplus:function(dir){ //public function that toggles the panel's state w/ animation. Optional dir parameter ("up" or "down") to explicitly set state.
var setting=this.setting
setting.dir=dir || ((setting.dir=="up")? "down" : "up")
if (setting.pointerimage.enabled)
setting.arrow.style.visibility="hidden"
clearTimeout(setting.revealtimer)
this.revealcontent()},

revealcontent:function()
{var setting=this.setting
var pcontent=setting.pcontent, curH=pcontent._currentheight, maxH=pcontent._actualheight, minH=setting.stateconfig.initial, steps=setting.animate.steps, dir=setting.dir
if (dir=="down" && curH<maxH || dir=="up" && curH>minH){
var newH = curH + (Math.round((maxH-curH)/steps)+1) * (dir=="up"? -1 : 1)
newH=(dir=="down")? Math.min(maxH, newH) : Math.max(minH, newH)
pcontent.style.height=newH+"px"
pcontent._currentheight=newH}

else{if (setting.pointerimage.enabled)
{setting.arrow.src=setting.pointerimage.src[(setting.dir=="down")? 1 : 0]
setting.arrow.style.visibility="visible"}
return}
 
var thispanel=this
setting.revealtimer=setTimeout(function(){thispanel.revealcontent()}, 10)},

initpanel:function()
{var setting=this.setting
var pcontainer=setting.pcontainer=document.getElementById(setting.ids[0])
var pcontent=setting.pcontent=document.getElementById(setting.ids[1])
var tdiv=setting.tdiv=document.getElementById(setting.ids[2])
pcontent.style.overflow="scroll"
pcontent._actualheight=pcontent.scrollHeight
setTimeout(function(){pcontent._actualheight=pcontent.scrollHeight}, 100)
pcontent.style.overflow="hidden"
pcontent._currentheight=(setting.dir=="down")? pcontent._actualheight : setting.stateconfig.initial
var thispanel=this
ddpanel.addEvent(tdiv, function(e){ //assign click behavior when toggle DIV tab is clicked on
if (setting.animate.enabled)
thispanel.togglepanelplus()
else
thispanel.togglepanel()
if (e.preventDefault) e.preventDefault()
return false}, "click")
if (setting.pointerimage.enabled)
{var pointer1=new Image(), pointer2=new Image()
pointer1.src=setting.pointerimage.src[0]
pointer2.src=setting.pointerimage.src[1]
setting.arrow=ddpanel.addpointer(tdiv.getElementsByTagName("span")[0], "pointerimage", setting.pointerimage.src[setting.dir=="down"? 1:0])}
if (setting.closepanelonclick.enabled){ //assign click behavior when panel content is clicked on (links within panel or elements with class "closepanel"
ddpanel.addEvent(pcontent, function(e)
{var target=e.srcElement || e.target
if (/(^|\s+)closepanel($|\s+)/.test(target.className) || target.tagName=="A" || (target.parentNode && target.parentNode.tagName=="A"))
{thispanel.togglepanel("up")}
}, "click")}},

uninit:function()
{var setting=this.setting
if (setting.stateconfig.persiststate){
ddpanel.setCookie(setting.ids[0], setting.dir)}
for (prop in setting){setting[prop]=null}}
} //end of ddpanel object

//initialize instance of DD Drop Down Panel:

var defaultpanel=new ddpanel({
 ids: ["mypanel", "mypanelcontent", "mypaneltab"], // id of main panel DIV, content DIV, and tab DIV
 stateconfig: {initial: "10px", persiststate: true}, // initial: initial reveal amount in pixels (ie: 5px)
 animate: {enabled: true, steps: 5}, //steps: number of animation steps. Int between 1-20. Smaller=faster.
 pointerimage: {enabled: true, src: ["http://the-exquisisticbox.com/wordpress/wp-content/themes/006/images/arrow1.gif", "http://the-exquisisticbox.com/wordpress/wp-content/themes/006/images/arrow2.gif"]},
 closepanelonclick: {enabled: true} // close panel when links or elements with CSS class="closepanel" within container is clicked on?
})