Hi Tanya,
Thanks for your interest in syncfusion products.
You can programmatically change stylesheet in javascript with the following code:
function mouseover(obj)
{
debugger
if(obj.NavigateURL=="")
{
obj.Element.style.cursor="crosshair";
}
Please refer the sample in the link below which illustrates the above:
http://www.syncfusion.com/support/user/uploads/SiteMapDataSourceBinding_7a692de8.zip
Please try running the above sample and let me know if this helps.
Thank you for your patience.
Regards,
Janagan.