mozilla firefox and google chrome differences in javascript new Date(); functionality 0o

hi there,
i am using the following javascript to currently create two date objects and compare them, this works in firefox from version 3.0+ atm.
html elements inspected after ajax population in firebug 1.8.3 within firefox 7.0.1:

<select tabindex="10" accesskey="i" id="menu_fromtimestamp" name="menu_fromtimestamp">
          <option>* Select Month From</option>
          <option value="2011-08-01 00:00:00">1st August 2011, 00:00:00</option>
          <option value="2011-09-01 00:00:00">1st September 2011, 00:00:00</option>
          <option value="2011-10-01 00:00:00">1st October 2011, 00:00:00</option>
          <option value="2011-11-01 00:00:00">1st November 2011, 00:00:00</option>
</select>
<select tabindex="11" accesskey="m" id="menu_totimestamp" name="menu_totimestamp">
          <option>* Select Month To</option>
          <option value="2011-11-30 23:59:59">30th November 2011, 23:59:59</option>
          <option value="2011-10-31 23:59:59">31st October 2011, 23:59:59</option>
          <option value="2011-09-30 23:59:59">30th September 2011, 23:59:59</option>
          <option value="2011-08-31 23:59:59">31st August 2011, 23:59:59</option>
</select>

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onchange functions for these two elements:

document.form_transactions.menu_fromtimestamp.onchange = function () {
	var fi = document.form_transactions.menu_fromtimestamp.selectedIndex;
	var ti = document.form_transactions.menu_totimestamp.selectedIndex;
	var from = document.form_transactions.menu_fromtimestamp.options[fi].value;
	var till = document.form_transactions.menu_totimestamp.options[ti].value;
	var fm = document.form_transactions.menu_fromtimestamp.options[fi].text.split(" ")[1];
	var tm = document.form_transactions.menu_totimestamp.options[ti].text.split(" ")[1];
	var fd = new Date(
			  	fm + " " +					// month
				from.split("-")[2] + ", " +		// dd,
				from.split("-")[0]				// yyyy
			 );
	var td = new Date(
			  	tm + " " +					// month
				till.split("-")[2] + ", " +		// dd,
				till.split("-")[0]				// yyyy
			 );
	if (td > fd) {
		return ajaxRequest(document.form_transactions.button_refresh);
	} else {
		alert("The TO date must be after the FROM date!"); return false;
	}
}
document.form_transactions.menu_totimestamp.onchange = function () {
	var fi = document.form_transactions.menu_fromtimestamp.selectedIndex;
	var ti = document.form_transactions.menu_totimestamp.selectedIndex;
	var from = document.form_transactions.menu_fromtimestamp.options[fi].value;
	var till = document.form_transactions.menu_totimestamp.options[ti].value;
	var fm = document.form_transactions.menu_fromtimestamp.options[fi].text.split(" ")[1];
	var tm = document.form_transactions.menu_totimestamp.options[ti].text.split(" ")[1];
	var fd = new Date(
			  	fm + " " +					// month
				from.split("-")[2] + ", " +		// dd,
				from.split("-")[0]				// yyyy
			 );
	var td = new Date(
			  	tm + " " +					// month
				till.split("-")[2] + ", " +		// dd,
				till.split("-")[0]				// yyyy
			 );
	if (td > fd) {
		return ajaxRequest(document.form_transactions.button_refresh);
	} else {
		alert("The TO date must be after the FROM date!"); return false;
	}
}

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now when selecting From 1st October, in firefox it works no problem no matter the version.
in google chrome however - it does not work! there is clearly some difference. the result is that it alerts one of these dates created, selected 1st October for From and 30th November for To, it says you can't select From date that is after the To date! :(
how the heck would i have to create these dates to compare, so that these functions are compatible for both Mozilla Firefox and Google Chrome?