what js event?

Hi
I have a form ( with 4 fields for numbers) and want a javascript function to divide the field input by 100 when we go to next field
first i need to know what event should be used
the function should be simple but i don't know how to set the argument
like:

function devideby100(number){
   var obj
   obj = document.getElementById('myfield')
obj.value='number/100'
}

Code (markup):

then my fields will be:

<input type="text" value="" OnEvent='divideby100();'

Code (markup):

But I'm sure it won't work. this is my first function in javascript. Please let me know the correct code
Thanks in advance

 

I think you should use onBlur="divideby100();".

 

If I understand your request this is what you need

function divideby100(obj) {
    var input = obj.value;
    if (input.length > 0 && !isNaN(input)) {
      obj.value = input/100;
    } else {
       obj.value = '';
    }
}

Code (markup):

<input type="text" onblur="divideby100(this)" />

Code (markup):

This protects you when the user types in something other than a number