I am trying to disable validation controls from JavaScript using the EnableValidator() method. The controls are within an ASP.NET Panel that can be enabled/disabled by selecting/clearing a checkbox. Following is the function that I have written to control the enabling/disabling of the validation controls.

function toogleValidationControlsForSource(targetControl, enableStatus){
    var validators = targetControl.getElementsByTagName("span");
    for (counter=0; counter < Page_Validators.length; counter++){
        for (nestedCounter=0; nestedCounter < validators.length; nestedCounter++){            
            // Shortlist validators by excluding any span elements beloging to Label and other controls...
            if (Page_Validators[counter].id == validators[nestedCounter].id){
                ValidatorEnable(String(validators[nestedCounter].id), Boolean(enableStatus));                
            }
        }
    } 
}

When I call this function, I receive the following JavaScript error in Internet Explorer: 

Line: 20
Char: 5
Error: 'style' is null or not an object

This wasted quite some of my time as I was unable to figure out where is it coming from within my code. Using the Firebug utility with Firefox, I have come to know that this error is coming from within 
WebResource.axd. Following is the detail that Firefox provides:

val.style has no properties
 
ValidatorUpdateDisplay("RequiredFieldValidator1")WebResource.axd (line 19)
ValidatorValidate("RequiredFieldValidator1", undefined, undefined)WebResource.axd (line 215)
ValidatorEnable("RequiredFieldValidator1", true)WebResource.axd (line 146)
toogleValidationControlsForSource(div#Panel1, true)WebResource.axd (line 66)
toogleControlState("Panel1", "Panel", "CheckboxExtender1")WebResource.axd (line 52)
onclick(click clientX=0, clientY=0)Default.aspx (line 1)
 
 val.style.visibility = val.isvalid ? "hidden" : "visible";  (This is the line 20 in Web.axd that is causing the error)
 
 
My finding is that this error has something to do with ValidatorEnable(). If I remove or comment this line the error goes away. Can anyone help tell me why am I getting this error and how am I supposed 
to get around with it?

I modified the last line to the following i.e. removed String() to stop it from casting the the id. But this did not solve the problem.

ValidatorEnable(validators[nestedCounter].id, Boolean(enableStatus));

hrmalik:

ValidatorEnable(validators[nestedCounter].id, Boolean(enableStatus));

That's probably because you're still just passing it the id of the validator and it's expecting a reference to the element itself. Try:

ValidatorEnable(validators[nestedCounter], Boolean(enableStatus));

Great! It solved the problem. Thanks for your help!