/*
 *   Retira espacos em branco nos 
 *   nos dois sentidos (direita e esquerda)      
 */
function trim(sString) {
    while (sString.substring(0,1) == ' ') {
        sString = sString.substring(1, sString.length);
    }
    while (sString.substring(sString.length-1, sString.length) == ' ') {
        sString = sString.substring(0,sString.length-1);
    }    
    return sString;
}