need help with simple statement

I put a test alert message in a script...the alert triggers 7 times. The code just looks at 7 user inserted items and adds them together and places the total into a field (I removed the last part for this test).
 
function mistot(){
 var ep = document.forms[0].elements;
 var myamt = 'm-amt';
 var mytot = 0;
for(var i=1; i<=8; ++1) {
 if(isFloat(ep[myamt=i].value)) {
  mytot += +ep[myamt+i].value;
 }
  alert('test');
 }
}
The alert message triggers 7 times because it is inside my "for" statement. However if I place the alert after the for statement...it does not trigger at all. What is wrong with my statment?
 
<snip>----
  mytot += +ep[myamt+i].value;
  }
 }
alert('test');
}

Well I would start with the fact that your code is not VBScript.

oops...