// our global vars
var heightnow;
var targetheight;
var block;
var slideinterval;
var divheights = new Array();

// the delay between the slide in/out, and a little inertia
var inertiabase = 1;
var inertiainc = 1;
var slideintervalinc = 1;
var inertiabaseoriginal = inertiabase;

function Createrray()
{
	// detect whether the user has ie or not, how we get the height is different 
	var useragent = navigator.userAgent.toLowerCase();
	var ie = ((useragent.indexOf('msie') != -1) && (useragent.indexOf('opera') == -1) && (useragent.indexOf('webtv') == -1));
	var divs = getElementsByClassName(document, "div", "slideblock");

	for(var i=0; i<divs.length; i++)
	{
		// get the original height
		var baseheight = (ie) ? divs[i].offsetHeight + "px" : document.defaultView.getComputedStyle(divs[i], null).getPropertyValue('height', null);

		// explicitly display it (optional, you could use cookies to toggle whether to display it or not)
		// divs[i].style.display = "none";
		// "save" our div height, because once it's display is set to none we can't get the original height again
		var d = new div();
		d.el = divs[i];
		d.ht = baseheight.substring(0, baseheight.indexOf("p"));

		// store our saved versoin
		
		divheights[i] = d;		
	}
}

// this is one of our divs, it just has a DOM reference to the element and the original height
function div(_el, _ht)
{
	this.el = _el;
	this.ht = _ht;
}

function close_exp()
{
	var divs = getElementsByClassName(document, "div", "slideblock");

	for(var i=0; i<divs.length; i++)
	{
		 divs[i].style.display = "none";
	}
}

function expand_exp()
{
	
	var divs = getElementsByClassName(document, "div", "slideblock");
	
	for(var i=0; i<divs.length; i++)
	{
		divs[i].style.display = "";
	}
}

function toggle_e(t,c)
{

	if (t=="") {
		t =document.getElementById("link_"+c);
		if (t == null)
		{
			return;		
		}
	}

	// reset our inertia base and interval
	inertiabase = inertiabaseoriginal;
	clearInterval(slideinterval);

	// get our block
	block = t.parentNode.nextSibling;

	// for mozilla, it doesn't like whitespace between elements
	if(block.className == undefined)
		block = t.parentNode.nextSibling.nextSibling;

	if(block.style.display == "none")
	{
	  
		block.style.display = "block";
		block.style.height = "1px";

		// our goal and current height
		targetheight = divheight(block);
		heightnow = 1;

		// our interval
	  	slideinterval = setInterval(slideout, slideintervalinc);
 	  	//document.getElementById('divFaq_'+c).style.background ='#efefef';
	}
	else
	{

		// our goal and current height
		targetheight = 1;
		heightnow = divheight(block);

		// our interval
		slideinterval = setInterval(slidein, slideintervalinc);
		//document.getElementById('divFaq_'+c).style.background ='';
	}
	//clearStyle();
}

// this is our slidein function the interval uses, it keeps subtracting
// from the height till it's 1px then it hides it
function slidein()
{
	if(heightnow > targetheight)
	{
		// reduce the height by intertiabase * inertiainc
		heightnow -= inertiabase;

		// increase the intertiabase by the amount to keep it changing
		inertiabase += inertiainc;

		// it's possible to exceed the height we want so we use a ternary - (condition) ? when true : when false;
		block.style.height = (heightnow > 1) ? heightnow + "px" : targetheight + "px";
	}
	else
	{
		// finished, so hide the div properly and kill the interval
		clearInterval(slideinterval);
		block.style.display = "none";
	}
}

// this is the function our slideout interval uses, it keeps adding
// to the height till it's fully displayed
function slideout()
{
	if(heightnow < targetheight)
	{
		// increases the height by the inertia stuff
		heightnow += inertiabase;

		// increase the inertia stuff
		inertiabase += inertiainc;

		// it's possible to exceed the height we want so we use a ternary - (condition) ? when true : when false;
		block.style.height = (heightnow < targetheight) ? heightnow + "px" : targetheight + "px";
		
	}
	else
	{
		// finished, so make sure the height is what it's meant to be (inertia can make it off a little)
		// then kill the interval
		clearInterval(slideinterval);
		block.style.height = targetheight + "px";
	}
}

// returns the height of the div from our array of such things
function divheight(d)
{
	for(var i=0; i<divheights.length; i++)
	{
		if(divheights[i].el == d)
		{
			return divheights[i].ht;
		}
	}
}

function clearStyle()
{
	for(var i=0; i<divheights.length; i++)
	{
		if((divheights[i].el.style.display != "none") && (divheights[i].el != block))
		{
			divheights[i].el.style.height = "1px";
			divheights[i].el.parentNode.parentNode.style.background ='';
			divheights[i].el.style.display = "none";
		}
	}
}

/*
	the getElementsByClassName function I pilfered from this guy.  It's
	a useful function that'll return any/all tags with a specific css class.

		Written by Jonathan Snook, http://www.snook.ca/jonathan
		Add-ons by Robert Nyman, http://www.robertnyman.com
*/
function getElementsByClassName(oElm, strTagName, strClassName)
{
	// first it gets all of the specified tags
    var arrElements = (strTagName == "*" && document.all) ? document.all : oElm.getElementsByTagName(strTagName);
    
	// then it sets up an array that'll hold the results
	var arrReturnElements = new Array();

	// some regex stuff you don't need to worry about
    strClassName = strClassName.replace(/\-/g, "\\-");

    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;

	// now it iterates through the elements it grabbed above
    for(var i=0; i<arrElements.length; i++)
	{
        oElement = arrElements[i];

		// if the class matches what we're looking for it ads to the results array
        if(oRegExp.test(oElement.className))
		{
            arrReturnElements.push(oElement);
        }   
    }

	// then it kicks the results back to us
    return (arrReturnElements)
}