Get value from image button when it is clicked?

[universelittle]

I have 2 questions about image buttons. Many Thanks!

// 1. How to make the image name became variable when it is clicked in php?

echo("<IMG SRC=\"arrow1.gif\" NAME=\"trade\" >");

// 2. I can use isset($_POST['trade']) function to know the button
has been clicked when the input type is "submit", and can get
value by $_POST['trade'].  But how to let php page know whether
the image button has been clicked, and how to get value in the
following 2 cases?

// use input element, but the type is image
echo("<input type=\"image\" src=\"arrow1.gif\" name=\"trade\" value=\"".$symbol"\">");

// use button element
echo("<button name=\"trade\" value=\"".$symbol."\" type=\"button\">trade
          <img src=\"arrow1.gif\"></button>");

[universelittle]

How to know the button has been clicked in the following 2 cases?

use input element, type is image

echo("<input type=\"image\" src=\"arrow1.gif\" name=\"trade\" value=\"".$symbol"\">");

use button element

echo("<button name=\"trade\" value=\"".$symbol."\" type=\"button\">trade
<img src=\"arrow1.gif\"></button>");

[DigitalExpl0it]

are you trying to use it as a link?

why not do this

<?
echo "<a href='link.php?value=$symbol'><IMG SRC='arrow1.gif' NAME='trade'></a>";
?>

so when clicked ont he image you goto a page called link.php

and a value is set by $symbol

so now all you do is take $value and do what ever with it.. maybe on the enxt page do this

<? echo "$value"; ?>

[universelittle]

Thank you. But the anchor is only valid to text or image link, not
<input> or <Button> element.

I just don't know how to make a link to the 2 type of buttons,
one is <input type="button">, another is<Button></Button>,
the only way i know is <form action="...">, but it is only valid
when the type is "submit".

Function isset() can detect whether a button has been clicked,
but only when you click the "submit" type button, other types
are invalid. How to know other type buttons are clicked or not,
such as <input type="button">, <Button></Button> before I use
header() to do redirection?

[lordrashmi]

I would use the code that was posted earlier and just put an anchor tag next to it:
echo("<a name="trade"><input type=\"image\" src=\"arrow1.gif\" name=\"trade\" value=\"".$symbol"\"></a>");