Free Script from www.javascriptkit.com

<script>
//Random password generator- by javascriptkit.com
//Visit JavaScript Kit (http://javascriptkit.com) for script
//Credit must stay intact for use
var keylist="abcdefghijklmnopqrstuvwxyz123456789"
var temp=''
function generatepass(plength){
temp=''
for (i=0;i<plength;i++)
temp+=keylist.charAt(Math.floor(Math.random()*keylist.length))
return temp
}
function populateform(enterlength){
document.pgenerate.output.value=generatepass(enterlength)
}
</script>
<form name="pgenerate">
<input type="text" size=18 name="output">
<input type="button" value="Generate Password" onClick="populateform(this.form.thelength.value)"><br />
<b>Password Length:</b> <input type="text" name="thelength" size=3 value="7">
</form>
<p align="center">This free script provided by<br />
<a href="http://javascriptkit.com">JavaScript
Kit</a></p>