function aplicaMascaraMiles() {
	var monto = document.forms[0].monto.value;
	var ary = new Array();
	var temp = '';
	ary = monto.split('.');
	for (i=0; i<ary.length; i++) {
		temp = temp + ary[i];
		//alert('temp '+i + ': '+temp);	
	}
	//alert('temp ' + temp);	
	var aux1 = '';
	var aux2 = '';
	if (temp.length>3) {
		aux1 = temp.substring(0, temp.length-3);
		aux2 = temp.substring(temp.length-3, temp.length);			
		temp = aux1 + '.' + aux2; 
	} 
	document.forms[0].monto.value = temp;
}