小型Jquery问题

我有一个JQUERY脚本在www.blishair.com.au.上运行

脚本将3个左手div设置为粘性，即当用户滚动div时。我一直试图让jquery在一个名为wholewrap的div上找到高度（顾名思义，它是整个站点的包装器）。一旦我得到了这个值，我想看看它是否小于某个值（目前我正在尝试1500px——反复尝试，看看哪一个有效）。如果整体包裹的高度小于我的预定尺寸，那么我希望setting2变量反映一个尺寸，否则反映另一个尺寸。

这是我的密码。我只想把setting2的高度设置为div wholewrap的高度（以阻止www.blishair.com.au上的溢出问题）我已经添加了整个JS文件，因为我不确定哪里出了问题：

function StickyScroller(obj, options)
{        
//Store function scope
var $this = this;
//Store initial top and left/right values
var top = $(obj).css('top');
var left = $(obj).css('left');
var right = $(obj).css('right');
var scroll = 0;
var tempScroll = 0;
//------------------------------------------------------------
// Set default property values
//------------------------------------------------------------
var defaults = {
start: 0,
end: 1000,
interval: 400,
margin: parseInt(top, 10),
range: 400
},  settings = jQuery.extend(defaults,options);
obj = $(obj);
settings.index = 0;
settings.oldIndex = 0;
//Accessors for settings
GetSet.getters({scope: $this, obj: settings});
//------------------------------------------------------------//
//                      Callback Functions                    //
//------------------------------------------------------------//
var Callback = {};
Callback.newIndex = function(){};  //When the index changes
Callback.limbo = function(){};     //When scroller not in range
Callback.scroll = function(){};    //On window scroll
//Get setters for Callback functions
GetSet.setters({scope: this, prefix: "on", obj: Callback});   
//=========================================================//
//Public distanceFrom
//Purpose: Determines the distance in pixels between
//         the scroller and an index
//Parameters:
//  index: The index whose distance from scroller will be calculated
//Postcondition: Returns an integer
//=========================================================//
this.distanceFrom = function(index)
{        
    tempScroll = $(window).scrollTop();
    //Check for both references: "Top" of the range and "bottom"
    var top = index*settings.interval;
    var bottom = index*settings.interval + settings.range;
    var distanceFromTop = Math.abs(tempScroll-top);
    var distanceFromBottom = Math.abs(tempScroll-bottom);
    //Return the smallest distance
    if(distanceFromTop < distanceFromBottom)
    {
        return distanceFromTop;
    }
    else
    {
        return distanceFromBottom;
    }        
};
var whwrap = $("#wholewrap").height();
var wrap2 = $("#wrap2").height();
var mwrapEDIT = $("#middlewrap").height();
var mwrap = (mwrapEDIT * .8);
if(whwrap < 1500)
    {
        var setting2 = wrap2;
    }
    else
    {
        var setting2 = mwrap;
    }   


//=========================================================//
//Public closestIndex
//Purpose: Determines the closest index
//Postcondition: Returns the closest index as an integer
//=========================================================//
this.closestIndex = function()
{
    //If index is 0, automatically return 1
    if(settings.index === 0)
    {
        return 1;
    }        
    //Distance from next/previous index
    var dPrev = this.distanceFrom(settings.index-1);
    var dNext = this.distanceFrom(settings.index+1);
    //Return the index associated with the smallest distance
    if(dPrev <= dNext)
    {
        return settings.index-1;
    }
    else
    {
        return settings.index+1;
    }
};
//=========================================================//
//Private getIndex
//Purpose: returns index
//=========================================================//
var getIndex = function()
{        
    tempScroll = $(window).scrollTop() + settings.margin;        
    //Make sure movement would be in the bounds
    if(tempScroll > settings.start && tempScroll < setting2)
    {                                       
        //Possible new index
        tempIndex = Math.floor((tempScroll-settings.start)/settings.interval);
        //Make sure the index is different before reassigning
        //or executing the callback
        if(tempIndex !== settings.index)
        {
            //Store old index
            settings.oldIndex = settings.index;                
            //Assign new index
            settings.index = tempIndex;                
        }
    }
    //If tempScroll goes beyond end mark, set distance at end mark
    else if(tempScroll >= setting2)
    {
        settings.oldIndex = settings.index;
        settings.index = Math.floor((setting2-settings.start)/settings.interval);
    }
    //If tempScroll goes beyond beginning mark, set distance at start
    else
    {
        settings.oldIndex = settings.index;
        settings.index = 0;
    }        
};
//=========================================================//
//Public firstIndex
//Purpose: Returns first index
//Postcondition: Returns an integer
//=========================================================//
this.firstIndex = function()
{
    return 0;
};
//=========================================================//
//Public lastIndex
//Purpose: Returns last index
//Postcondition: Returns an integer
//=========================================================//
this.lastIndex = function()
{
    return Math.floor((setting2-settings.start)/settings.interval);
};
//=========================================================//
//Public inRange
//Purpose: Determines if the scroller is in interval range
//Postcondition: Returns boolean
//=========================================================//
this.inRange = function()
{      
    var scroll = $(window).scrollTop() - settings.start + settings.margin;        
    var inRange = (scroll >= settings.index * settings.interval) &&
    (scroll <= (settings.index*settings.interval + settings.range));
    return inRange;
};

//------------------------------------------------------------//
//                    On Browser Scroll                       //
//------------------------------------------------------------//    
var wrap = $('<div id="scrollcontainer">').css(
{
    width: obj.width(),
    height: obj.height(),
    position: "absolute"
});
obj.wrap(wrap);
$(window).scroll(function()
{
    scroll = $(window).scrollTop() + settings.margin;
    //Get the current index
    getIndex();
    //If scroll less than beginning, set back to beginning
    if(scroll < settings.start)
    {
       $(obj).css({
        position : 'absolute',
        top: 0,
        left: 0,
        right: 0});
       $("#scrollcontainer").css({
        position : 'absolute',
        top: settings.start,
        left: left,
        right: right});
    }
    //If scroll greater than ending position, set to end
    else if(scroll > setting2) 
    {
       $(obj).css({
        position : 'absolute',
        top: 0,
        left: 0,
        right: 0});
       $("#scrollcontainer").css({
        position : 'absolute',
        top: setting2,
        left: left,
        right: right});
    }
    //Make sure we stay in the specified boundaries
    else
    {
        //Put back to fixed
        $(obj).css({
        position : 'fixed',
        top: settings.margin,
        left: left,
        right: right});
    }        
    //If in the specified range and a new index, do the callback        
    if(settings.oldIndex !== settings.index)
    {
       Callback.newIndex(settings.index);
    }
    //Do the "limbo" call back, which is a callback that executes when
    //the scroller is not in the range, but still between start and end
    if( !$this.inRange() && scroll > settings.start && scroll < setting2 )
    {
       Callback.limbo(settings.index);
    }
    //Do the scroll callback regardless of what happens
    Callback.scroll(settings.index);
});

}

我走对了吗？

谢谢。