start workflow using javascript while on item creation

hi friends

i have two workflows for one list item.

i have to start my workflows by javascripton item creation

i am able to start workflow using javascript for already created items but am unable to start for new items

in my scenario i am using custom save button with

"onclick="javascript: {ddwrt:GenFireServerEvent('__commit')}; AfterSave();"

if am using

"onclick="javascript: AfterSave();"

it is working fine for already created id's

"onclick="javascript: {ddwrt:GenFireServerEvent('__commit')}; AfterSave();"

if am using above code it is not working for old id's also.

how can i start workflow on item created using javascript