&lt;form&nbsp;name="form1"&nbsp;method="POST"&nbsp;action="liu.asp"&nbsp;onsubmit="return&nbsp;CheckForm(this);"&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br>&lt;input&nbsp;name="liu"&nbsp;type="text"&nbsp;id="liu"&nbsp;&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br>&lt;input&nbsp;name="liu1"&nbsp;type="text"&nbsp;id="liu1"&nbsp;&gt;&nbsp;<br>&lt;input&nbsp;name="liu2"&nbsp;type="text"&nbsp;id="liu2"&nbsp;&gt;&nbsp;<br>&lt;input&nbsp;name="liu3"&nbsp;type="text"&nbsp;id="liu3"&nbsp;&gt;<br>&lt;input&nbsp;name="liu4"&nbsp;type="text"&nbsp;id="liu4"&nbsp;&gt;<br>&lt;input&nbsp;name="liu5"&nbsp;type="text"&nbsp;id="liu5"&nbsp;&gt;<br>&lt;input&nbsp;name="Submit"&nbsp;type="submit"&nbsp;value="ꡡ"&gt;<br><br><br>&lt;SCRIPT&gt;<br>&lt;!--<br>function&nbsp;is_number(str)<br>{<br>exp=/[^0-9()-]/g;<br>if(str.search(exp)&nbsp;!=&nbsp;-1)<br>{<br>return&nbsp;false;<br>}<br>return&nbsp;true;<br>}<br>function&nbsp;is_email(str)<br>{&nbsp;if((str.indexOf("@")==-1)(str.indexOf(".")==-1)){<br><br>return&nbsp;false;<br>}<br>return&nbsp;true;<br>}<br>function&nbsp;CheckForm(theForm)<br>{<br>if&nbsp;(theForm.user.value.length&nbsp;==&nbsp;0)<br>{<br>alert("û")<br>theForm.user.focus()<br>return&nbsp;false<br>}<br>if&nbsp;(document.form1.user.value.indexOf("&lt;")!=-1&nbsp;&nbsp;document.form1.user.value.indexOf("&gt;")!=-1)<br>{<br>alert("ûаǷַ&nbsp;(&lt;,&gt;)&nbsp;");<br>document.form1.user.focus();<br>return&nbsp;false;<br>}<br>if&nbsp;(document.form1.user.value.indexOf("'")!=-1)<br>{<br>alert("ûаǷַ&nbsp;(')&nbsp;");<br>document.form1.user.focus();<br>return&nbsp;false;<br>}<br>if&nbsp;(theForm.bt.value.length&nbsp;==&nbsp;0)<br>{<br>alert("⣡")<br>theForm.bt.focus()<br>return&nbsp;false<br>}<br>if&nbsp;(document.form1.bt.value.indexOf("&lt;")!=-1&nbsp;&nbsp;document.form1.bt.value.indexOf("&gt;")!=-1)<br>{<br>alert("ıаǷַ&nbsp;(&lt;,&gt;)&nbsp;");<br>document.form1.bt.focus();<br>return&nbsp;false;<br>}<br>if&nbsp;(document.form1.bt.value.indexOf("'")!=-1)<br>{<br>alert("ıаǷַ&nbsp;(')&nbsp;");<br>document.form1.bt.focus();<br>return&nbsp;false;<br>}<br><br><br><br>if&nbsp;(document.form1.qq.value.indexOf("&lt;")!=-1&nbsp;&nbsp;document.form1.qq.value.indexOf("&gt;")!=-1)<br>{<br>alert("ģѣǷַ&nbsp;(&lt;,&gt;)&nbsp;");<br>document.form1.qq.focus();<br>return&nbsp;false;<br>}<br>if&nbsp;(document.form1.qq.value.indexOf("'")!=-1)<br>{<br>alert("ģѣǷַ&nbsp;(')&nbsp;");<br>document.form1.qq.focus();<br>return&nbsp;false;<br>}<br><br><br>if&nbsp;(document.form1.home.value.indexOf("&lt;")!=-1&nbsp;&nbsp;document.form1.home.value.indexOf("&gt;")!=-1)<br>{<br>alert("ҳǷַ&nbsp;(&lt;,&gt;)&nbsp;");<br>document.form1.home.focus();<br>return&nbsp;false;<br>}<br>if&nbsp;(document.form1.home.value.indexOf("'")!=-1)<br>{<br>alert("ҳǷַ&nbsp;(')&nbsp;");<br>document.form1.home.focus();<br>return&nbsp;false;<br>}<br><br>if(&nbsp;form1.emil.value&nbsp;=="")&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;alert("E-mail&nbsp;!")<br>form1.emil.focus();<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;false;<br>&nbsp;&nbsp;&nbsp;&nbsp;}<br><br>if(!is_email(form1.emil.value))<br>{&nbsp;alert("ǷEMailַ");<br>form1.emil.focus();<br>return&nbsp;false;<br>}<br><br><br>if&nbsp;(theForm.add.value.length&nbsp;==&nbsp;0)<br>{<br>alert("ĵַ")<br>theForm.add.focus()<br>return&nbsp;false<br>}<br>if&nbsp;(document.form1.add.value.indexOf("&lt;")!=-1&nbsp;&nbsp;document.form1.add.value.indexOf("&gt;")!=-1)<br>{<br>alert("ĵַаǷַ&nbsp;(&lt;,&gt;)&nbsp;");<br>document.form1.add.focus();<br>return&nbsp;false;<br>}<br>if&nbsp;(document.form1.add.value.indexOf("'")!=-1)<br>{<br>alert("ĵַаǷַ&nbsp;(')&nbsp;");<br>document.form1.add.focus();<br>return&nbsp;false;<br>}<br><br>if&nbsp;(theForm.text.value.length&nbsp;==&nbsp;0)<br>{<br>alert("ݣ")<br>theForm.text.focus()<br>return&nbsp;false<br>}<br>if&nbsp;(document.form1.text.value.indexOf("&lt;")!=-1&nbsp;&nbsp;document.form1.text.value.indexOf("&gt;")!=-1)<br>{<br>alert("аǷַ&nbsp;(&lt;,&gt;)&nbsp;");<br>document.form1.text.focus();<br>return&nbsp;false;<br>}<br>if&nbsp;(document.form1.text.value.indexOf("'")!=-1)<br>{<br>alert("аǷַ&nbsp;(')&nbsp;");<br>document.form1.text.focus();<br>return&nbsp;false;<br>}<br><br>&nbsp;return&nbsp;true<br>}<br>//--&gt;<br>&lt;/SCRIPT&gt;