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regEx to allow A-Z and single spaces only?

I am using a simple "onkeyup" with a regEx to replace anything but letters as the user types into a small text input. Works great... but I need to modify it so that *single* spaces are allowed.

Currently the code looks like this
<input type="text" size="12" maxlength="12" name="pfWord" id="pfWord"
onkeyup="this.value=this.value.replace(/[^a-z]/ig, '')">

How should I alter the regEx to also say
"allow spaces AND letter a-z"
"replace more than one space with a single space"
1 Solution
onkeyup="this.value=this.value.replace(/[^a-z][\s]{1,1}/ig, '')"
ZvonkoSystems architectCommented:
Check this:

<input type="text" size="12" maxlength="12" name="pfWord" id="pfWord"
onkeyup="if(!this.value.match(/^([a-z]+\s?)*$/i))this.value=this.value.replace(/[^a-z ]/ig,'').replace(/\s+/g,' ')" >

MichaelEvangelistaAuthor Commented:
PERFECT Zvonko, thank you!

Mr_Egyptian: this worked, except double spaces were removed rather than replaced with a single space.
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