That would be pretty obvious if it didn't work. I tried

alert(jQuery('body').length)

with 1.3.1 and 1.2.6 in FF3 and IE7 and they both returned 1 as they should. If you can create a simple test case, attach it.

javascript:(function(){window.t=document.createElement('script');window.t.src='http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js';window.document.body.appendChild(window.t);setTimeout(function(){alert(jQuery('body').length);},2000)})();

You can copy the sentence above here. Then link to http://www.gcforum.org/forumdisplay.php?fid=2410 and paste it to address bar.

It both returned 0 in FF3 and IE7. Thanks for your reply.

It sounds like some other code on that page is interfering with jQuery. I couldn't see it in a quick look at common.js where I figured it would be. So, if you can create a simple test case that demonstrates the problem, attach it. If you need help debugging the code, it would be best to post on a forum because we haven't yet established this is a bug in jQuery. A simple test case would help to determine that.

I found commom.js overrides Array.prototype.push function.

Array.prototype.push = function(value) {
	this[this.length] = value;
	return this.length;
}

It seems that affects result of "ret.push( array[i] )". (at 2026 line of jQuery1.3.1.js)

It caused jQuery('body');==> body.length will be 0;

Does that problem resemble #2721?

I found commom.js overrides Array.prototype.push function.

Array.prototype.push = function(value) {
	this[this.length] = value;
	return this.length;
}

It seems that affects result of "ret.push( array[i] )". (at 2026 line of jQuery1.3.1.js) It caused jQuery('body');==> body.length will be 0; Does that problem resemble #2721?

Sounds like this was a problem outside jQuery.