function getElmById(aID){
	var element = null;
	
	if(document.getElementById) element=document.getElementById(aID);
	else if(document.layers) element=document.layers[aID];
	else if(document.all) element=document.all[aID];
	
	return element; 
}
function abre_ventana(dir,ancho,alto){
	window.open(dir,"_blank","width="+ancho+",height="+alto+",menubar=no,toolbar=no,status=no,location=no,scrollbars=no");
}
function abre_ventana1(dir,ancho,alto){
	window.open(dir,"_blank","width="+ancho+",height="+alto+",menubar=no,toolbar=no,status=no,location=no,scrollbars=yes");
}