what js event?

[promotingspace.net]

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'
}

then my fields will be:
<input type="text" value="" OnEvent='divideby100();'

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

[scriptdance]

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

[Autodidact]

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

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