dynamic display of a control depending on condition

Question

Dear friends! I have following problem. I have one data list in which there is one image and one label. Now I have two conditions and depending upon which i have to perform two different operatoins on this datalist. Like say in one condition i have to open one pop up onclick of this Image and in another condition i want to just redirect to other page onclick of this image. so at runtime i have to decide and depending upon the result i have to carry out two different operations on this image. My problem is not how to decide.I have a criteria to decide this, but how to show this at runtime to this image on the front end? please help.. regards.. kash