/*
 * @description : string.trim();
 */
String.prototype.trim = function() { 
	return this.replace(/(^\s*)|(\s*$)/g, ""); 
}

/*
 * @description : isNumber(obj)
 */
function isNumber(str)
{
    return !isNaN(str);
}

/*
 * @description : Add to favorite
 */
function favorite(title,url) { 
    if (window.sidebar) {
        window.sidebar.addPanel(title,url,"");
    } else if( document.all ) {
        window.external.AddFavorite(url,title);
    } else if( window.opera && window.print ) {
        return true;
    }
}

function isEmptyTextBox(){
    var txtUid = document.getElementById("txtUid");
    var txtPwd = document.getElementById("txtPwd");
    var ret;
    ret = txtUid.value == "";
    if(ret){ 
        alert('Please enter username.')
        return false;
    }
    ret = txtPwd.value == "";  
    if(ret){
        alert('Please enter password.')
        return false;
    }
    return true;
}