Using parameter variable as ID name?

Edit: Disregard this question, I had an issue passing my third parameter to my JS function, which happened to be the variable I was questioning
Silly thread by me =\

Hello, seeing as how I'm not experienced with javascript syntax, I would like to know how to pass a variable as string in such a way below:

function showUser(c)
{ 
  document.getElementById("txtHint");
  // document.getElementById(c); (I would like to use variable c in place of the ID name.  I'm not sure of the proper syntax, though.
}

showUser(<?=$count?>);

Code (markup):

Any suggestions?
thanks!

 

Hi,
the only thing you need to do is to say JS, that the argument in your function is a string, using whatever quotes - showUser('<?=$count?>');
Without that, you're passing the value of php $count as a JS variable... Hope you see what I mean