Problemas con código js

[salva_bxt]

Buenas, tengo este código javascript que en teoria lo que hace es permitir contraer y expandir ciertos elementos en html y tal.

Código:

function featuresHash() {
	var hashValue = window.location.hash.toString().split('#')[1];
	
	if ($("a[name='" + hashValue + "']").length != 0 && hashValue.length != 0) {
		$("a[name='" + hashValue + "']").closest("div.feature-item-content").removeClass("unselected");
		$("a[name='" + hashValue + "']").closest("div.feature-item-content").addClass("selected");
		$("a[name='" + hashValue + "']").closest(".features-item-content").toggle();
		location.hash = '#' + hashValue;
	}
}

$(document).ready(function(){
	$(".features-item-content").hide();
	featuresHash();
	$(".features-item-head").click(function() {
		if($(this).hasClass("unselected")){
			$(this).removeClass("unselected");
			$(this).addClass("selected")
			}else{
			if($(this).hasClass("selected")) {
				$(this).removeClass("selected");
				$(this).addClass("unselected")
			}
		}
		$(this).parent().children(".features-item-content").toggleFadeSlide(300)
	});
	$(".expandall").show();
	$(".expandall span").text("Expand all");
	var a=false;
	$(".expandall span").click(function(){
	if(a==false) {
		$(".features-item-content").hide().toggleFadeSlide(300);
		a=true;
		$(".expandall span").text("Collapse all");
		$(".features-item-head").removeClass("unselected").addClass("selected")
		} 
		else {
		$(".features-item-content").show().toggleFadeSlide(300);
		a=false;
		$(".expandall span").text("Expand all");
		$(".features-item-head").removeClass("selected").addClass("unselected")
	}
});

$("span.feature-collapse").before('<img src="/theme/images/features/sm-arrow-up.gif" alt="Collapse" class="floatleft collapse" />');
	$("span.feature-collapse").show();
	$("span.feature-collapse").click(function() {
	$(this).parent().toggleFadeSlide(300);
	$(this).parent().parent().children(".features-item-head").removeClass("selected").addClass("unselected")
});

$("span.define-gpl").qtip({
	content:"What does this mean? Quite simply, you can use phpBB for whatever purpose you wish provided 1) You keep our copyright in the source and 2) If you distribute the code, it's also released under the GPLv2.",
	style:{
		fontSize:11,
		lineHeight:1.2,
		name:"cream"
	},
	position:{
		corner:{
			target:"topMiddle",
			tooltip:"bottomLeft"
		}
	}
});

$("span.define-hash").qtip({
	content:"Think of hashing as one-way encryption. There's no way to get the original text via decryption, so it's much safer.",
	style:{
		fontSize:11,
		lineHeight:1.2,
		name:"cream"
	},
	position:{
		corner:{
			target:"topMiddle",
			tooltip:"bottomLeft"
		}
	}
});

$("span.define-captcha").qtip({
	content:'CAPTCHA stands for "<strong>C</strong>ompletely <strong>A</strong>utomated <strong>P</strong>ublic <strong>T</strong>uring test to tell <strong>C</strong>omputers and <strong>H</strong>umans <strong>A</strong>part." Weird name, awesomely effective.',
	style:{
		fontSize:11,
		lineHeight:1.2,
		name:"cream"
	},
	position:{
		corner:{
			target:"topMiddle",
			tooltip:"bottomLeft"
		}
	}
});

$("span.define-utf8").qtip({
	content:"UTF-8 stands for Universal Character Set Trasformation Format - 8-bit.",
	style:{
		fontSize:11,
		lineHeight:1.2,
		name:"cream"
	},
	position:{
		corner:{
			target:"topMiddle",
			tooltip:"bottomLeft"
		}
	}
})
});

Sin embargo no se hace ese "efecto" que he comentado, ademas el firebug de firefox me manda todos estos errores

TypeError: $("span.define-gpl").qtip is not a function

tooltip:"bottomLeft"

features_fn.js (línea 68)

TypeError: $(this).parent().children(".features-item-content").toggleFadeSlide is not a function

$(this).parent().children(".features-item-content").toggleFadeSlide(300)

features_fn.js (línea 31)

TypeError: $(this).parent().children(".features-item-content").toggleFadeSlide is not a function

$(this).parent().children(".features-item-content").toggleFadeSlide(300)

features_fn.js (línea 31)

TypeError: $(this).parent().children(".features-item-content").toggleFadeSlide is not a function

$(this).parent().children(".features-item-content").toggleFadeSlide(300)

features_fn.js (línea 31)

TypeError: $(this).parent().children(".features-item-content").toggleFadeSlide is not a function

$(this).parent().children(".features-item-content").toggleFadeSlide(300)

features_fn.js (línea 31)

TypeError: $(this).parent().children(".features-item-content").toggleFadeSlide is not a function

$(this).parent().children(".features-item-content").toggleFadeSlide(300)

features_fn.js (línea 31)

TypeError: $(this).parent().children(".features-item-content").toggleFadeSlide is not a function

$(this).parent().children(".features-item-content").toggleFadeSlide(300)

features_fn.js (línea 31)

TypeError: $(this).parent().children(".features-item-content").toggleFadeSlide is not a function

$(this).parent().children(".features-item-content").toggleFadeSlide(300)

features_fn.js (línea 31)

¿Como podría solucionarlo?¿Necesitariais que pusiera el código html también?