javascript-php -> SELECT boxes

Hi folks Need some javascript-php help, maybe even some little code. the situation is the following I have select input eg echo "<SELECT name=year><OPTION value=''>Choose"; for($y=1995;$y<=2005;$y++){ echo "<OPTION value='$y'";if($year==$y){echo "SELECTED";}echo ">"; } echo "</SELECT>"; And continuing in the same manner I have month and day dropdowns as well. And actually I have the same type of fields on the next line as well (only different names).So it would look like: dateone : day month year datetwo : day month year What I need, is when dateone has been selected (in other words, none of the columns are ''), then datetwo fields would be given (shown) exactly the same values. And now the most important part, when user starts to select datetwo now, then he shouldn´t have the possiblity to select earlier date that datetwo, that should be forbidden. As one is actually contract start date and the second is contract end date,this is important to get to work like that. Now, the question is, how would it be possible? I think I could use some kind of code...it would probably be the most helpful as I`m far from a javascript genius. Thank you in advance, Siim Einfeldt