$(document).ready(function(){

//Store Image paths
var toggleMinus = '/images/_.gif';
var togglePlus = '/images/+.gif';

var $subHead = $('.children').parent();
var $subHeadOpen = $('.childrenopen').parent();
//Add the Plus image to every child by default
$subHead.prepend('<img src="' + togglePlus + '" alt="+" /> ');
$subHeadOpen.prepend('<img src="' + toggleMinus + '" alt="-" /> ');
//By Default put the Menu in collapsed state
$('.children').parent().children('ul').slideUp('fast');

//Expand All Code
$('.expand').click(function() {
		$subHead.children('ul').slideDown('fast');
		$('img', $subHead).attr('src', toggleMinus);
});

//Contract All Code
$('.contract').click(function() {
		$subHead.attr('src', toggleMinus).children('ul').slideUp('fast');
		$('img', $subHead).attr('src', togglePlus);
});

//Expand or Contract one particular Nested ul
$('img', $subHead).addClass('clickable').click(function() {
var toggleSrc = $(this).attr('src');
if ( toggleSrc == toggleMinus ) {
$(this).attr('src', togglePlus).parent().children('ul').slideUp('fast');
} else{
$(this).attr('src', toggleMinus).parent().children('ul').slideDown('fast');
};
});
$('img', $subHeadOpen).addClass('clickable').click(function() {
var toggleSrc = $(this).attr('src');
if ( toggleSrc == toggleMinus ) {
$(this).attr('src', togglePlus).parent().children('ul').slideUp('fast');
} else{
$(this).attr('src', toggleMinus).parent().children('ul').slideDown('fast');
};
});

});