IAD_String = {};
/**
 * Object : remove leading spaces
 * @str : string
 */
IAD_String.lStrip = function(str)
{
    return str.replace(/^\s+/, "");
}

/**
 * Object : remove trailing spaces
 * @str : string
 */
IAD_String.rStrip = function(str)
{
    return str.replace(/\s+$/, '');
}

IAD_String.concat = function(a, b)
{
    return a + " " + b;
}