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<form action="" method="post" name="myform" onsubmit="return CheckPost();">
SCRIPT language=javascript>
function CheckPost()
{
 
if (myform.user.value=="")
 {
  alert("ÇëÌîдÓû§");
  myform.user.focus();
  return false;
 }
 if (myform.title.value.length<5)
 {
  alert("±êÌâ²»ÄÜÉÙÓÚ5¸ö×Ö·û");
  myform.title.focus();
……
}
2¡¢str_replaceÌæ»»º¯Êý
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function htmtocode($content) {
   $content = str_replace("\n", "<br>", str_replace(" ", " ", $content));
   return $content;
}
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<?php
/*
 * Created on 2010-1-5
 * Author :CHAUVET
 * Function£º±»°üº¬ÔÚÆäËûÒ³ÃæµÄÍ·²¿Ò³Ã棬ÑÝʾinclude()
 */
 	function ReplaceSomeWords($words){
 		$words=str_replace("\n","<br/>",str_replace(" "," ",$words));
 		return $words;
 	}
?>
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 <html>
 <head>
  <title>Ìí¼ÓÒ³Ãæ</title>
  <style type="text/css">
   body{font-size:12px;text-align:center;}
   #capation{font-size:24px;font-famliy:"»ªÎÄÐÂκ";}
  </style>
  <script type="text/javascript">
   function ClearInputWords(){
    document.myForm[0].value="";
    document.myForm[1].value="";
    document.myForm[2].value="ÇëÔÚ´ËÊäÈëÄúµÄÁôÑÔ£¡";
   }
   function CheckInput(){
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