html中触发php代码

<div> <form name="form1" method="post" action=""> <input name="button" type="reset" value="Flood" onclick="pstdatasearch.php"/> </form> </div> <?php // Get the search variable from URL require_once('config.php'); //connect to your database ** EDIT REQUIRED HERE ** $connection=mysql_connect(DB_HOST, DB_USER, DB_PASSWORD); //(host, username, password) //specify database ** EDIT REQUIRED HERE ** mysql_select_db(DB_DATABASE,$connection) or die("Unable to select database"); //select which database we're using // Build SQL Query $result = mysql_query ("SELECT * FROM pstdisaster Where type = 'Flood'",$connection); // EDIT HERE and specify your table and field names for the SQL query print "<table border='1'>"; print "<th align = 'center'>Name</th>"; print "<th align = 'center'>Type</th>"; print "<th align = 'center'>Date</th>"; print "<th align = 'center'>Location</th>"; print "<th align = 'center'>Level</th>"; print "<th align = 'center'>Government reaction</th>"; print "<th align = 'center'>Public response</th>"; print "<th align = 'center'>Sourse</th>"; print "<th align = 'center'>Damages</th>"; // now you can display the results returned while ($row= mysql_fetch_array($result)) { //echo "$count.) $title   $title2  $title3   $title4   $title5   $title6   $title7   $title8 $nbsp; $title9" ; // (5) Print out each element in $row, that is, print the values of print "<tr> \n"; print "<td align = 'center'>{$row["name"]}</td>"; print "<td align = 'center'>{$row["type"]}</td>"; print "<td align = 'center'>{$row["date"]}</td>"; print "<td align = 'center'>{$row["location"]}</td>"; print "<td align = 'center'>{$row["level"]}</td>"; print "<td align = 'center'>{$row["Reaction"]}</td>"; print "<td align = 'center'>{$row["Responses"]}</td>"; print "<td align = 'center'>{$row["Sourse"]}</td>"; print "<td align = 'center'>{$row["damages"]}</td> <br> </n>"; print "</tr> \n"; // Print a carriage return to neaten the output print "\n"; } ?> 我要的效果是 点击按钮 后再出现表单 而且之后还有多个按钮 点其他按钮会触发其他代码 覆盖之前输出的表格

追问：dcument.get是做什么用的？ 我改成这样了 但是点击按钮 没任何动作  if之后语句不运行
<?php
$a=$_GET['act'];
if($a==1){  原代码段}
else if（$a==2）{原代码段}

答案：<div id=info></div>
<input type=button onclick=pstdatasearch.php?act=1 />
<input type=button onclick=pstdatasearch.php?act=2 />
<?php
if(_GET('act')==1){
document.getElementById('info').innerHTML = 'aaaaaaaaaa';
}else if(_GET('act')==2){
document.getElementById('info').innerHTML = 'bbbbbbbbbbbbbb';}
?>

其他：var url= 设置一个公用DIV id=show.用JS的onclick触发后用AJAX去取得PHP内容,再用document.getElementById("show").innerHTML=返回的内容...这样就行了,这样当你每次触发,DIV里的内容都会改变... 用JS把