Scilligence

There is still a large amount users use earlier IE versions including version 6, 7 and 8.  Because there is no SVG or Cavas support in IE 6, 7 and 8, it has to use VML, which is slow especically handling large molecules and reactions.

As an alternative to VML, Silverlight is much faster.  But not all computers have it installed.  In JSDraw 1.3.4, it is able to show a message to suggest your users to install silverlight.  In order to do so, you need to have following line of code:

<script type='text/javascript'>
scilligence.suggestInstallSilverlight();
</script>

If it is not IE version 6, 7 or 8, this line won't do anything.