Open site in Sharepoint Designer 2007
Click File > New > Workflow, which opens Workflow Designer window
Enter the name of the workflow in the appropriate box
Select the list name (Source List) from what sharepoint list should this workflow be attached to dropdownlist
After selecting the list from the dropdownlist, select at least on checkbox from the following:
‘Allow this workflow to be started manually from an item
Automatically start this workflow when a new item is created
Automatically start this workflow whenever an item is changed (optional)
Click Next
Enter the Step Name in the appropraite box
Click on the Conditions buttons and select the Compare Source List item


Click on the field and select the field name (ID), like that give the condition "equal" to the "List Name:ID"
Now, click on the Actions button to perform what action to be done if the condition is satisfied "Update item in List"
Again, Click on the Actions button and select stop the workflow and enter the message