How come this doesn't work?

for (i=0;i!=(row*col);i++){
total+=parseFloat(eval("value"+(i+1)));
trace(total);
trace(parseFloat(eval("value"+(i+1))));
total is a variable from a dynamic text box and the
eval("value"+(i+1)) variables are from input text boxes. The
trace(parseFloat(eval("value"+(i+1)))); displays the values entered
in the input boxes correctly but the trace(total); displays NULL
everytime.
Variables row and col both = 2, and the input text values =
random integer (entered by user).
I'm probably missing something really stupid but i can't see
what is wrong with this.

Ah forget it, i just had to do total = 0; before hand, even
though when i did this without using eval() it worked without
having to be pre defined.

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