CFGRID - validate user has selected a row?

Hi,
How do you verify someone has selected a row in a CFGRID
before clicking a submit button? Right now I have to use a
cftry/cfcatch to error trap the user from click the submit button
before selecting a row in a cfgrid.
Many thanks,
Kiley

<cfinput type="Button" name="btn_submit" value="Click Me"
onclick="canSubmit();">
function canSubmit(){
if(gridName.selectedIndex != undefined){
submitForm();
else{
alert('Please select a record from the grid first...');
Ken

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