$(document).ready(function(){
	jQuery('.banner_css').hide();
	jQuery('#banner1').show();
	$(".left_button").hover( function(){
		jQuery('.banner_css').hide();
		var bannerId = this.id;
		var bannerImage = jQuery(this).attr("src");
		bannerImage = bannerImage.replace('.gif', "-1.gif");
		jQuery(this).attr("src", bannerImage);
		jQuery('#'+bannerId).show();
	},
			function()
			{
					var bannerImage = jQuery(this).attr("src");
					bannerImage = bannerImage.replace('-1', "");
					jQuery(this).attr("src", bannerImage);
			
			}
	);
});

function trim(str)
  {	
	return str.replace(/^\s*|\s*$/g,"");
  }