how to Call a Javascript or jquery when asp.net validator validate?

[mek4321]

I have an asp.net application.. i have added validation controls added in my aspx pages.i just want to Make Enable or Disable one Image based on validator's Validate event fires on Clientside..how can i call a Javascript when Validator controls fires Validate ?I mean is there any Clientside event like OnValidate or afterValidate of CompareFieldValidator Control ???Thanks