jquery toggle html

$.fn.toggleText=function(t1,t2){
	if(this.text()==t1)this.text(t2);
	else this.text(t1);
	return this;
};

$(document).ready(function(){
	$(".shch").click(function(){
		$(this).toggleText('+','-');
		$(this).closest('li').children('ul').slideToggle();
		return false;
	});
});