JavaScript Tutorial/Event/returnValue
Set event return value to false (IE)
<source lang="javascript">
<html> <head> <title>A Simple Page</title> <script language="JavaScript">
</script> </head> <body onHelp="yourhelp()"> </body> </html></source>
<source lang="javascript">
<html> <head> <title>A Simple Page</title> <script language="JavaScript">
</script> </head> <body onHelp="yourhelp()"> </body> </html></source>