var oldonload = window.onload;

window.onload = function(){
	if (oldonload) {
	  oldonload();
	}
	
	/* Rollover */
	var img1   = new Image();
	var img2   = new Image();
	var img3   = new Image();
	var img1_off   = new Image();
	var imgtmp = null;
	var imgsrc = '';
	img1.src = '/docroot/educacion/img/imagen_on_01.gif';
	img2.src = '/docroot/educacion/img/imagen_on_02.gif';
	img3.src = '/docroot/educacion/img/imagen_on_03.gif';
	img1_off.src = '/docroot/educacion/img/imagen_off_01.gif';
	/* Botón 1 */
	document.getElementById('bot01').onclick = action_boton1;
	document.getElementById('bot01').onfocus = action_boton1;
	function action_boton1(){
		if(imgtmp != null){
			imgtmp.src = imgsrc;
		}
		imgtmp = this.firstChild;
		imgsrc = this.firstChild.src;
		this.firstChild.src = img1.src;
		document.getElementById('texto_campanias_01').style.visibility = 'visible';
		document.getElementById('texto_campanias_02').style.visibility = 'hidden';
		document.getElementById('texto_campanias_03').style.visibility = 'hidden';
		return false;
	}
	/* Botón 2 */
	document.getElementById('bot02').onclick = action_boton2;
	document.getElementById('bot02').onfocus = action_boton2;
	function action_boton2(){
		if(imgtmp != null){
			imgtmp.src = imgsrc;
		}
		imgtmp = this.firstChild;
		imgsrc = this.firstChild.src;
		this.firstChild.src = img2.src;
		document.getElementById('bot01').firstChild.src = img1_off.src;
		document.getElementById('texto_campanias_01').style.visibility = 'hidden';
		document.getElementById('texto_campanias_02').style.visibility = 'visible';
		document.getElementById('texto_campanias_03').style.visibility = 'hidden';
		return false;
	}
	/* Botón 3 */
	document.getElementById('bot03').onclick = action_boton3;
	document.getElementById('bot03').onfocus = action_boton3;
	function action_boton3(){
		if(imgtmp != null){
			imgtmp.src = imgsrc;
		}
		imgtmp = this.firstChild;
		imgsrc = this.firstChild.src;
		this.firstChild.src = img3.src;
		document.getElementById('bot01').firstChild.src = img1_off.src;
		document.getElementById('texto_campanias_01').style.visibility = 'hidden';
		document.getElementById('texto_campanias_02').style.visibility = 'hidden';
		document.getElementById('texto_campanias_03').style.visibility = 'visible';
		return false;
	}
}