//We wrap all the code in an object so that it doesn't interfere with any other code
var scroller = {
  init:   function() {
    scroller.docH = document.getElementById("content").offsetHeight;
    scroller.contH = document.getElementById("container").offsetHeight;
    if(scroller.docH > 190){
    	document.getElementById("scrollArea").style.display = "block";
    	scroller.scrollAreaH = document.getElementById("scrollArea").offsetHeight;
    	

    	
	    //calculate height of scroller and resize the scroller div
	    //(however, we make sure that it isn't to small for long pages)
	    //scroller.scrollH = (scroller.contH * scroller.scrollAreaH) / scroller.docH;
	    scroller.scrollH = 28;
	    //if(scroller.scrollH < 15) scroller.scrollH = 15;
	    document.getElementById("scroller").style.height = Math.round(scroller.scrollH) + "px";
	    
	    //what is the effective scroll distance once the scoller's height has been taken into account
	    scroller.scrollDist = Math.round(scroller.scrollAreaH-scroller.scrollH);
	    
	        
	    //make the scroller div draggable
	    Drag.init(document.getElementById("scroller"),null,0,0,-1,scroller.scrollDist);
	    
	    //add ondrag function
	    document.getElementById("scroller").onDrag = function (x,y) {
	      var scrollY = parseInt(document.getElementById("scroller").style.top);
	      var docY = 0 - (scrollY * (scroller.docH - scroller.contH) / scroller.scrollDist);
	      document.getElementById("content").style.top = docY + "px";
	    }
  	}
  }
}

onload = scroller.init;