<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=windows-1251" /> <title>Документ Без Имени</title> </head> <body> <input type="text" name="textfield" onkeyup="this.value=this.value.replace(/\W|[a-z]/i,'')"/> </body> </html>