client side - javascript variables -

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hello wondering why firbug stating nan when these inputs have information entered. 

    for(i=1;i<8;i++){ var field = document.contactform.field + i.value; console.log(field);      }

i trying iterate through field1, field2 field3 .... field7.

i assume have number of fields field0 ... field8.

for that, need use different notation:

var field = document.contactform[field + i].value;

by way, while forms can accessed name way show, more preferable approach document.forms array:

 var field = document.forms["contactform"]["field" + i].value;

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