Looping Tip I
You can save 1 character when looping by changing the i on the last time used:
//not so god
for(i=0;i<3;i++){
alert(i);
}
//best
for(i=0;i<3;){
alert(++i);
}
Note: works with -- too (but modify the loop accordingly to avoid infinite looping)
Looping Tip II
There are certain scenarios where you can save one character by playing with the incrementing operator and values:
for(i=0;i++<9;)
for(i=0;++i<10;)
Note: you need to pay attention when for example 0 to -1. and 9 to 10, 99 to 100, so play around until you find a way to save the character