Direct URL to Specific Slide

I am using a slider called mySlider, or SL_Slider..

It uses the MooTools library...

If i am on the page with the slider, there is a simple script for the href that calls the appropriate slide..

<a href="javascript:mySlider.numPress(3);">link</a>

I believe this script is supposed to have the ability to also allow for a specific slide to load if the page in question is accessed via a URL link (from another page). There is a function that looks to be looking for a "passedID" variable (pasted below).

My problem is that i can't seem to figure out how to pass this variable to the script via a URL (or even if that's possible)...

I've tried all sort of combos and no luck...

Here is an example I tried (plus a ton of others): www.website.com?passedID=3

Any help would be much appreciated!

(If there is any additional info required, i am happy to paste it.

Thanks.

Mac

slideIt: function(passedID) {

        var self = this;

        //get item to slide out
        var curItem = self.options.items[self.options.itemNum]; 
        if(self.options.numNavActive == true){
            var curNumItem =  self.numNav[self.options.itemNum];
        }

        //check for passedID presence
        if(passedID != null) {
            if(self.options开发者_JAVA百科.itemNum != passedID){
                if(self.options.itemNum > passedID) { 
                    self.direction = 0; 
                } else { 
                    self.direction = 1;
                }
                self.options.itemNum = passedID;
            }
        }
        else{
            self.changeIndex(); 
        }

var slide_num_in_url = document.location.hash.split("#").join("");
mySlider.numPress(slide_num_in_url);

EDIT:

Call when the page loads.

window.onload = function()
{
    var slide_num_in_url = document.location.hash.split("#").join("");
    mySlider.numPress(slide_num_in_url);
}