function u_toggle(a) {
	var x = $(a);
	var z = $(a).firstDescendant().firstDescendant().identify();
	var p = $(a).readAttribute('class');
	// alert (p);
	var y = $(a).getStyle('height'); 
	xx = y.substring(0,y.length-2); 
	if (xx == 204 && p == 'modulo4') {
		new Effect.Scale(a, 19, {scaleX: false, scaleContent: false, scaleMode: 'box'}); 
		$(z).setStyle({background: 'url(images/css_img/350_violet.gif) no-repeat 0 -42px'});
		} 
		else if (xx < 204 && p == 'modulo4') {
		new Effect.Scale(a, 100, {scaleX: false, scaleMode:{originalHeight: 204}, scaleFrom: 19, scaleContent: false}); 
		$(z).setStyle({background: 'url(images/css_img/350_violet.gif) no-repeat'});
		}
	if (xx == 204 && p == 'modulo3') {
		new Effect.Scale(a, 19, {scaleX: false, scaleContent: false, scaleMode: 'box'}); 
		$(z).setStyle({background: 'url(images/css_img/245_violet.gif) no-repeat 0 -42px'});
		} 
		else if (xx < 204 && p == 'modulo3') {
		new Effect.Scale(a, 100, {scaleX: false, scaleMode:{originalHeight: 204}, scaleFrom: 19, scaleContent: false}); 
		$(z).setStyle({background: 'url(images/css_img/245_violet.gif) no-repeat'});
		}
	if (xx == 204 && p == 'modulo2') {
		new Effect.Scale(a, 19, {scaleX: false, scaleContent: false, scaleMode: 'box'}); 
		$(z).setStyle({background: 'url(images/css_img/245_violet.gif) no-repeat 0 -42px'});
		} 
		else if (xx < 204 && p == 'modulo2') {
		new Effect.Scale(a, 100, {scaleX: false, scaleMode:{originalHeight: 204}, scaleFrom: 19, scaleContent: false}); 
		$(z).setStyle({background: 'url(images/css_img/245_violet.gif) no-repeat'});
		}
	if (xx == 204 && p == 'modulo1') {
		new Effect.Scale(a, 19, {scaleX: false, scaleContent: false, scaleMode: 'box'}); 
		$(z).setStyle({background: 'url(images/css_img/172_violet.gif) no-repeat 0 -42px'});
		} 
		else if (xx < 204 && p == 'modulo1') {
		new Effect.Scale(a, 100, {scaleX: false, scaleMode:{originalHeight: 204}, scaleFrom: 19, scaleContent: false}); 
		$(z).setStyle({background: 'url(images/css_img/172_violet.gif) no-repeat'});
		}
}