Accessing Calendar On .net UserControl By Javascript?

Jan 6, 2011

I'm working on an ASP.NET app.I'm using a UserControl for a year calendar.This UserControl has 12 asp.net calendar controls (for the 12 months of a year)

I'm trying to build a jscript function that can access to one (or more) of the 12 month calendar, but I can't access them.

example:

"<asp:Calendar ID="CalendarJanuary" runat="server"></asp:Calendar>"

here's my function

function SetCalendar(controlId) {

document.getElementById(controlId+'_CalendarJanuary').VisibleDate = somedate
}

but this is allways throwing an error:'Microsoft JScript runtime error: 'document.getElementById(...)' is null or not an object'

it seems is not finding the calendar and I'm sure i'm passing the right controlID

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