function load_casa()
{
	sel=document.getElementById("casasel");
	casa=sel.options[sel.selectedIndex].value;
	this.location.href = 'casabonos+casa-'+casa+'.html';
}
function clickCat(cat)
{
	if(cat=='all')
		document.chgform.action='bonos.html';
	else
		document.chgform.action='bonos+show-'+cat+'.html';
	document.chgform.submit();
}