/* RollOverImages

--------------------------------------------------------------------------	*/

var rollOver = function(){this.init();}
rollOver.prototype = {
	init: function(){
		var imgs = new Image();
		var hovers = this.getElmByClsName("hover");
		for(var i=0,f=hovers.length; i < f; i++) {
			(function(i) {
				var img = hovers[i].getElementsByTagName('img')[0];
				var filetype = img.src.substring(img.src.lastIndexOf('.'), img.src.length);
				hovers[i].off = img.src;
				hovers[i].on = img.src.replace('_off' + filetype, '_on' + filetype);
				hovers[i].onmouseover = function(){img.src = hovers[i].on;}
				hovers[i].onmouseout = function(){img.src = hovers[i].off;}
			})(i);
		}
	},
	getElmByClsName: function(clsName){
		var elms = new Array();
		var re = new RegExp('(^| )' + clsName + '( |$)');
		var ael = document.getElementsByTagName('a');
		var op = (navigator.userAgent.indexOf("Opera") != -1) ? true : false;
		if (document.all && !op) ael = document.all;
		for(var i=0,j=0,f=ael.length ; i<f ; i++) {
			if(re.test(ael[i].className)) {
				elms[j]=ael[i];
				j++;
			}
		}
		return elms;
	}
}

window.onload = function(){
	new rollOver();
}



function backToTop() {
  var x1 = x2 = x3 = 0;
  var y1 = y2 = y3 = 0;
  if (document.documentElement) {
      x1 = document.documentElement.scrollLeft || 0;
      y1 = document.documentElement.scrollTop || 0;
  }
  if (document.body) {
      x2 = document.body.scrollLeft || 0;
      y2 = document.body.scrollTop || 0;
  }
  x3 = window.scrollX || 0;
  y3 = window.scrollY || 0;
  var x = Math.max(x1, Math.max(x2, x3));
  var y = Math.max(y1, Math.max(y2, y3));
  window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));
  if (x > 0 || y > 0) {
      window.setTimeout("backToTop()", 25);
  }
}