I have a lab management webapp that lists servers on my network. With a click in IE I can open a terminal services session to that server. The code works in IE, but not in chrome or firefox. Can anyone suggest how I can make this work in Chrome (Firefox would be nice too, but Chrome is more important.)

PHP Code:
<span style="color:blue;cursor:hand;" onClick="runApp('mstsc /v 10.1.2.3'); return false;" title="Click to open Terminal Services session">HOSTNAME</span