function Get_Cookie(name) {
   var start = document.cookie.indexOf(name+"=");
   var len = start+name.length+1;
   if ((!start) && (name != document.cookie.substring(0,name.length))) return null;
   if (start == -1) return null;
   var end = document.cookie.indexOf(";",len);
   if (end == -1) end = document.cookie.length;
   return unescape(document.cookie.substring(len,end));
}

function Set_Cookie(cookieName, cookieValue, nDays) {
	var today = new Date();
	var expire = new Date();
	if (nDays==null || nDays==0) nDays=1;
	expire.setTime(today.getTime() + 3600000*24*nDays);
	document.cookie = cookieName+"="+escape(cookieValue)
	             + ";expires="+expire.toGMTString();
}

function buscarMateria(materia)
{
	var formulario;
	formulario = document.getElementById('form_buscar_publicacion');

	formulario.chk_materia.checked = true;
	formulario.chk_materia.value = 1;
	formulario.materia.value 	= materia;
	formulario.tipo.value 		= 'avanzada';
	formulario.enviar.value 	= 'enviar';
	formulario.submit();
}