function formatCurrency(num) {
    num = num.toString().replace(/\$|\,/g,'');
    if(isNaN(num))
        num = "0";
    sign = (num == (num = Math.abs(num)));
    num = Math.floor(num*100+0.50000000001);
    cents = num%100;
    num = Math.floor(num/100).toString();
    if(cents<10)
        cents = "0" + cents;
    for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
        num = num.substring(0,num.length-(4*i+3))+'.'+
        num.substring(num.length-(4*i+3));
    return (((sign)?'':'-') + num + ((cents>0)?','+cents:''));
	// Sin centavos para guaranies
	//return (((sign)?'':'-') + num);
}
function no_coma(obj) {
	obj.value = obj.value.split(",").join(".");
}