jQuery conditional select problems
<p>I have some problems with part of jQuery code in my form. Everything works fine except one part of code:</p>

<pre><code>if ( $("#finish_day").val() &gt; 4 ) {
    $('#start').attr('', '');
} else {
    $('#start, #end').not(this)
        .children('option[value=' + this.value + ']')
        .attr('selected', '')
        .siblings().attr('disabled', true);
}
</code></pre>

<p>Whole example you can test here: <a href="http://jsfiddle.net/amarcinkowski/k7kKV/3/" rel="nofollow">http://jsfiddle.net/amarcinkowski/k7kKV/3/</a></p>

<p>Here is the thing:</p>

<p>First problem: 
When I change the "Hour" field it automatically change me the "City" field, and after then I can't change the City. When i cut the above code the City field works fine.</p>

<p>Second problem:
I need to have all of "City1" options always active (now when I change the "Hour" I have one active option, and other disabled). The code above should work like this: When the value of "total day" field is less than (for example) 3 the value in "City2" field is the same as in "City1" field (City1: Katowice = City2: Katowice), and other options in City2 field are disabled.</p>

<p>I will be grateful for any help.</p>
