Thread: Help with function in Javascript+PHP

Hello, I have a piece of code that is taking an enormous quantity of time to run slowing down a personal app. Could you help me checking my code and/or letting me know what could be causing the problem? I'm not an experienced programmer as you may see. But trying to get to it!

This code function is to fill a text field with my client's name when I write down the client's ID in a previous field.

Code:

function mostrarCliente(idCod, idNom){
	var Nombre;
	<? $LeerClientes=mysql_query("SELECT * FROM data.clients WHERE Status='0' ORDER BY ID ASC"); ?>
	switch(document.getElementById(idCod).value)
	{
		<?
		$LC=$LeerClientes;
		while($Clientes=mysql_fetch_array($LC))
		{
		?>
		case '<? echo $Clientes["ID_empresa"]; ?>':
			Nombre = "<? echo $Clientes["Nombre"]; ?>";
			break;
		<?
		}
		?>
		default:
			Nombre = '';
	}
	document.getElementById(idNom).value = Nombre;
}

I truly appreciate your help! This is driving me crazy!

Thanks!