InfoPath Dev

Hello, My requirement is that i have a repeating table and in that repeating table there is a drop down which has yes and no as the option...i want a text box which will display the total number of yes that the user has selected in the repeating table drop down box...how can i achieve this...i am using infopath 2007 and the form is browser enabled. Thanks

Use a count expression with filtering:

count(/path/to/repeating/node[dropdownField = 'yes'])