How to force mask on field with javacript

I need force mask to input value on my form field.

my number format is:

99999-999

how can i force this mask input on my input text using javascript?

Thank you
fsouzaAsked:
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GaryCommented:
<input type=text id="phone" onkeydown="numberformat()">
<script>
function numberformat(){
	inputvalue=document.getElementById("phone").value
	inputvalue=inputvalue.replace("-","")
	if(inputvalue.length>4){
		document.getElementById("phone").value=
		inputvalue.substring(0, 5)+"-"+inputvalue.substring(5, 15)
	}
}
</script>

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http://jsfiddle.net/GaryC123/7cHC6/2/
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fsouzaAuthor Commented:
Works fine!
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