var scrolldelay;

function pageScrollL() {
    	window.scrollBy('-5',0); // horizontal and vertical scroll increments
    	scrolldelay = setTimeout('pageScrollL()',15); // scrolls every 100 milliseconds
		checkPos();
}

function pageScrollR() {
    	window.scrollBy('5',0); // horizontal and vertical scroll increments
    	scrolldelay = setTimeout('pageScrollR()',15); // scrolls every 100 milliseconds
		checkPos();
}

function stopScroll() {
//	alert(parseInt($('gallery').getStyle('width'))+' / Scroll:'+getScrollX()+' /winSize:'+getWinWidth())
	clearTimeout(scrolldelay);
}

function checkPos(mode) {
		if($('gallery') == null) return;
		var RightS = $('rightScroll');
		var LeftS = $('leftScroll');
		var Gallery = $('gallery');
			var galWidth = parseInt(Gallery.getStyle('width'))

		var Lfx = new Fx.Styles(LeftS, {duration:500, wait:false});
		/*if(getScrollX() > 0 && LeftS.getStyle('opacity') == '0') {
			Lfx.start({opacity:1})
		}
		else */if(getScrollX() == 0){
			//Lfx.start({opacity:1})
			if(mode != 'init') {stopScroll()}
		}

		var Rfx = new Fx.Styles(RightS, {duration:500, wait:false});
		if(mode == 'init' || (galWidth - getScrollX() - getWinWidth() > 0 && RightS.getStyle('opacity') == '0')) {
			//RightS.setStyle('display','')
			Rfx.start({opacity:1})
		}
		else if(galWidth - getScrollX() - getWinWidth() == 0) {
			//RightS.setStyle('display','none')
			Rfx.start({opacity:0})
			if(mode != 'init') {stopScroll()}
		}
}

function getWinWidth() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
  return myWidth;
//  window.alert( 'Height = ' + myHeight );
}

function getScrollX() {
  var scrOfX = 0, scrOfY = 0;
  if( typeof( window.pageYOffset ) == 'number' ) {
    //Netscape compliant
    scrOfY = window.pageYOffset;
    scrOfX = window.pageXOffset;
  } else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
    //DOM compliant
    scrOfY = document.body.scrollTop;
    scrOfX = document.body.scrollLeft;
  } else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
    //IE6 standards compliant mode
    scrOfY = document.documentElement.scrollTop;
    scrOfX = document.documentElement.scrollLeft;

  
  }
//  return [ scrOfX, scrOfY ];
  return scrOfX;
}