function submitTag(form){
    var tag = form.usertag.value; 
    if(tag =='' || trim(tag)=='add your tags here'){
        alert("Please enter your tag.");
        return false;
    }
    return true;
}

function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}

function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}