$(function(){
	initRollOverImages();
	smoothScroll();
});
function initRollOverImages() {
  var image_cache = new Object();
  $("#content_bt a img").each(function(i) {
    var imgsrc = this.src;
    var dot = this.src.lastIndexOf('.');
    var imgsrc_on = this.src.substr(0, dot) + '_on' + this.src.substr(dot, 4);
    image_cache[this.src] = new Image();
    image_cache[this.src].src = imgsrc_on;
    $(this).hover(
      function() { this.src = imgsrc_on; },
      function() { this.src = imgsrc; });
  });
}

function smoothScroll(){
	$('a[href^=#]').click(function(){
		var href = this.hash;
		var $target = $(href == '#_top' ? 'body' : href);
		
		if($target.size()){
			var top = $target.offset().top;
			$(jQuery.browser.safari ? 'body' : 'html').animate({scrollTop:top},800,'swing');
		}
		return false;
	});
}