window dot open hides half the newly opened window

window dot open hides half the newly opened window

I am trying to open a new window after an on click event but i am having a
problem. Half of the opened window is hidden on the right most side of the
desktop, i am having to drag it so i could see it.
This is my code :
if ($j==0){echo "<a
onclick=\"window.open(this.href,'','resizable=yes,location=no,scrollbars=yes,dependent=yes,width=1000,height=900,status');
return false\"
href='display_offer_GP.php?CodeOfferReflet=$row[7]&CodeOfferArtemis=$row[8]'><img
id='m_$i'BORDER=0 src=\"images/loupe.gif\" ></a>&nbsp;
" ;
Any thoughts on why this is happening ? thank you
EDIT: i don't to find a solution for this because that i know how to do,
what i want is to understand why is this happening ?