var collapsedHeight = 28;
$(document).ready(function(){ 
	$('.links_collapse').css('overflow', 'hidden').each(function() { // hide content when section isn't large enough
		$(this).css('max-height', $(this).height()); // assign expanded height to max-height css property
	}).height(collapsedHeight); 
	
	$('.links_collapse h6').mousedown(function(){	// attach function to click event
		if ($(this).parent().height() > collapsedHeight) {
			$('.links_collapse').animate({height: collapsedHeight}, 1000);	// close all collapsible sections
			$(this).css('background-image', 'url(images/plus.gif)');
		} else {
			$('.links_collapse h6').css('background-image', 'url(images/plus.gif)');
			$('.links_collapse').animate({height: collapsedHeight}, 1000);	// close all collapsible sections
			$(this).css('background-image', 'url(images/minus.gif)');
			$(this).parent().animate({height: $(this).parent().css('max-height')}, 1000); // open clicked on section
		}
	});
});