[TYPO3] get parameter

[Andrea Giorgini]

Hi list,

I call a website I am building with a get parameter: 
http://my.site/index.php?reset=1

but from my php:

if (t3lib_div::_GET('reset') == '1')
	....

I cannot read it... completely ignored.
Can someone exaplain me why and how to avoid it?

thx a lot

Andrea