function trim(stringa){
    while (stringa.substring(0,1) == ' '){
        stringa = stringa.substring(1, stringa.length);
    }
    while (stringa.substring(stringa.length-1, stringa.length) == ' '){
        stringa = stringa.substring(0,stringa.length-1);
    }
    return stringa;
}

function leftTrim(stringa) 
{
	while (stringa.substring(0,1) == ' ')
	{
		stringa = stringa.substring(1, stringa.length);
	}
	return stringa;
}

function rightTrim(stringa) 
{
	while (stringa.substring(stringa.length-1, stringa.length) == ' ')
	{
		stringa = stringa.substring(0,stringa.length-1);
	}
	return stringa;
}