Checkbox not checking, initially

[zybernau]

a weird behaviour from my check box,

i am having one check box inside a form,

while checking i am setting values to the variables,
one of the variable has one more event triggered from that .

every thing goes fine , after all these, the check box state is not changed, at the initial click only, after that it works good

code format of mine

check box check event()
{
 var1="";
var2="";
var3=7;
}

var2changed_event()
{
 dosomething();
}

do u guys experience same issue with check box?

please help the need ful

thanks,
raj.