try this code
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<html><head>
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_validateForm() { //v4.0
var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
if (val) { nm=val.name; if ((val=val.value)!="") {
if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
} else if (test!='R') { num = parseFloat(val);
if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
min=test.substring(8,p); max=test.substring(p+1);
if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
} } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
} if (errors) alert('The following error(s) occurred:\n'+errors);
document.MM_returnValue = (errors == '');
}
//-->
</script>
</head>
<body>
<?php
if (!$FriendEmail) {
?>
<br>
<form name="form1" onsubmit="MM_validateForm('Name','','R','Email','','RisEmail','FriendName','','R','FriendEmail','','RisEmail') ;return document.MM_returnValue" action="" method="POST">
<div align="center">
<table width="427" border="0" cellspacing="0" cellpadding="3">
<tr>
<td width="69" align="right" valign="top"> </td>
<td width="5"><font face="Verdana" size="2"> </font></td>
<td width="113"><font face="Verdana" size="2">Name: </font> </td>
<td width="216"> <font face="Verdana" size="2">E-mail:</font></td>
</tr>
<tr>
<td align="right" valign="top"><font face="Verdana" size="2"><b>You:</b></font></td>
<td> </td>
<td>
<font face="Verdana">
<input type="text" name="Name" size="15"><font size="2"> </font></font>
</td>
<td>
<font face="Verdana">
<input type="text" name="Email" size="20"><font size="2"> </font></font>
</td>
</tr>
<tr>
<td align="right" valign="top"><font face="Verdana" size="2"><b>Friend:</b></font></td>
<td> </td>
<td>
<font face="Verdana">
<input type="text" name="FriendName" size="15"><font size="2"> </font>
</font>
</td>
<td>
<font face="Verdana">
<input type="text" name="FriendEmail" size="20"><font size="2"> </font>
</font>
</td>
</tr>
<tr>
<td align="right" valign="top"><font face="Verdana" size="2"><b>Message:</b></font></td>
<td> </td>
<td colspan="2">
<font face="Verdana">
<textarea name="emailtext" cols="38" rows="6" style="font-family: Trebuchet MS; font-size: 10pt">
I found this great website and I believe you would be interested in it.
Here is the link to that page: <?php echo $QUERY_STRING ?>
</textarea><font size="2"> </font></font>
</td>
</tr>
<tr>
<td align="right"> </td>
<td><font face="Verdana" size="2"> </font> </td>
<td>
<font face="Verdana">
<input type="submit" value="Send" name="Submit"><font size="2"> </font>
</font>
</td>
<td> </td>
</tr>
</table>
</div>
</form>
<?php
}
else {
if ($FriendEmail) { mail( $FriendEmail, "Message from $Name", "$FriendName, \n\n".$emailtext ."\n\n$Name", "From: $Email"); }
echo "<center><br><br><font face=Verdana size=2>Thank you <font color=red>$Name</font>. The email has been sent to <font color=red>$FriendName</font>. <br><br><a href='javascript:window.close();'>Close this window</a></font><p>
<font face=Verdana size=2>powered by: <a href=http://www.simplewebsols.com/phpscripts.php target=new>simple sendtofriend</a></font></p>";
}
?>
<p> </p>
</body>
</html>