$(document).ready(function(){
	var original_image = 'url(http://www.sporometrics.com/wordpress/wp-content/themes/sporometrics/images/content_button_more.gif)';
	var second_image = 'url(http://www.sporometrics.com/wordpress/wp-content/themes/sporometrics/images/content_button_less.gif)';
	//hide the all of the element with class msg_body
	$(".post_col p").hide();
	//toggle the componenet with class msg_body
	$(".expand").click(function(){
		$(this).next(".post_col p").slideToggle(350);
		if ($(this).css('background-image').replace(/"/g, '') == original_image) {
			$(this).css('background-image', second_image);
		} else {
			$(this).css('background-image', original_image);
		}
		return false;
	});
});