/** This is high-level function.
 * It must react to delta being more/less than zero.*/
function handle(delta) 
{
    //alert(document.getElementsByTagName('iframe').length);
    if(document.getElementsByTagName('iframe').length>0) 
    {
        if(delta < 0) //move left
        {
            var nextPosition = parseInt(getCurrentPos()) + 1075;
            //if(document.getElementsByTagName('iframe').length>0)
                var nextScroll = parseInt(window.frames['wind'].document.getElementById('helper2').innerHTML) + 1;
            //else
              //  var nextScroll = parseInt(document.getElementById('helper2').innerHTML) + 1; 
        }
        else //move right
        {
            var nextPosition = parseInt(getCurrentPos()) - 1075;
            //if(document.getElementsByTagName('iframe').length>0)
                var nextScroll = parseInt(window.frames['wind'].document.getElementById('helper2').innerHTML) - 1;
           // else
             //   var nextScroll = parseInt(document.getElementById('helper2').innerHTML) - 1; 
        }
        if(nextPosition >= 0 && nextScroll <= 21)
        {
            if(document.getElementsByTagName('iframe').length>0)     
	            window.frames['wind'].scrollTo(nextPosition, 0);
	        else
                window.scrollTo(nextPosition, 0);
            
            updateCurrentPos(nextPosition);
            //alert(nextScroll);
            updateScrollBitFromWheel(nextScroll);
        }
    }
}

/** Event handler for mouse wheel event.*/
function wheel(event)
{
        var delta = 0;
        if (!event) /* For IE. */
                event = window.event;
        if (event.wheelDelta) { /* IE/Opera. */
                delta = event.wheelDelta/120;
                /** In Opera 9, delta differs in sign as compared to IE.*/
                if (window.opera)
                        delta = -delta;
        } else if (event.detail) { /** Mozilla case. */
                /** In Mozilla, sign of delta is different than in IE.
                 * Also, delta is multiple of 3.*/
                delta = -event.detail/3;
        }
        /** If delta is nonzero, handle it.
         * Basically, delta is now positive if wheel was scrolled up,
         * and negative, if wheel was scrolled down.*/
        if (delta)
                handle(delta);
        /** Prevent default actions caused by mouse wheel.
         * That might be ugly, but we handle scrolls somehow
         * anyway, so don't bother here..*/
        if (event.preventDefault)
                event.preventDefault();
	event.returnValue = false;
}

function getCurrentPos()
{
    if(document.getElementsByTagName('iframe').length>0)
        x = window.frames['wind'].document.getElementById('helper').innerHTML;
    else
        x = window.document.getElementById('helper').innerHTML;
    //alert(x);
    return x;
}

function updateCurrentPos(amnt)
{
    //alert(amnt);
     if(document.getElementsByTagName('iframe').length>0)
        window.frames['wind'].document.getElementById('helper').innerHTML= amnt;
    else
        window.document.getElementById('helper').innerHTML= amnt;
}

/** Initialization code. 
 * If you use your own event management code, change it as required.*/
if (window.addEventListener)
        /** DOMMouseScroll is for mozilla. */
        window.addEventListener('DOMMouseScroll', wheel, false)
/** IE/Opera. */
window.onmousewheel = document.onmousewheel = wheel;