Help needed in Java Script

HI all,
can anyone tell me what is the meaning of following code ? Please !!
Code
<script language="JavaScript">
function enable_button()
document.form1.SelectBut.disabled =false;
<td><font size=4 color="Blue">Please Select the .CSV file to e-mail</font></td><input type=FILE Accept="csv/*" size=30 name="acsvfile" title="Find a vaild .CSV file and Click SEND_EMAIL button" onclick="onChange=enable_button()"></tr>
</table>
Thanx in advance.
Regards,
Ashvini

The form has a file input button (acsvfile) and a submit button (SelectBut). The SelectBut is initially disabled until the user clicks on the acsvfile button to select a file for upload.
However I don't believe that it works the way that it i intended. The enable_button function gets called on the onClick event and the SelectBut will always be enabled even if the user cancels the file selection.
You may want to remove the onClick and use :
function enable_button()
    if (document.x.acsvfile.value == "") {
         document.x.SelectBut.disabled =true;
    } else {
        document.x.SelectBut.disabled =false;
<td><font size=4 color="Blue">Please Select the .CSV file to e-mail</font></td><input type=FILE Accept="csv/*" size=30 name="acsvfile" title="Find a vaild .CSV file and Click SEND_EMAIL button" onChange="enable_button()" onKeyDown="blur();"   ></tr> This will only enable the SelectBut if the user selects a file but will not allow the user to manually enter a file. You may want to be nice and add a clear button tp remove any files they have selected.

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