jQuery.fn.InstructorExpander = function(){
	
		return this.each(function(index){
		
			var $xpandContent 	=	$(this);
			var $btn 			=	$xpandContent.next().find('a');;
			//$btn.css('cursor', 'pointer');
			
			var defaultURL 		= 	$btn.children().attr("src");
			var fileType 		= 	defaultURL.substring(defaultURL.lastIndexOf('.'), defaultURL.length);
			var overImageURL 	= 	defaultURL.replace(fileType, '_a' + fileType);
			
			var img = new Image();
			img.src = overImageURL;
			
			
			var isActive = false;
			$xpandContent.hide();
			
			
			$btn.click(function(){
				isActive =!isActive;
				
				if(isActive)
				{
					$xpandContent.slideDown('fast');
					$btn.children().attr("src", overImageURL);
				}
				else
				{
					$xpandContent.slideUp('fast');
					$btn.children().attr("src", defaultURL);
				}
				
				return false;
				
			})
		});
}