$(document).ready(function (){
	$("#formularioBusca").submit(function(){
		montaBases(this);
	}); 
});

function montaBases(formulario)
{
	var bases = "";
	var cbs = $(formulario).find("input[type=checkbox]:checked");
	for (var i = 0; i < cbs.length; i++)
	{
		if (bases != "")
			bases += "|";
		bases += $(cbs[i]).attr("value");
	}
	if (cbs.length <= 0)
		bases = "f|e|m";
	$("#legisExterna").val(bases);
}