var ClientTabs = new Object();

ClientTabs.selectTab = function(controlId, tabId)
{
    // Get previous value
   
    var hiddenField = document.getElementById(controlId + '_hidden');
    var prevTabId = hiddenField.value;
    
    // Hide previous tab
    document.getElementById(prevTabId + '_tab').className = 'tab unselectedTab';
    document.getElementById(prevTabId).style.display = 'none';
    
    // Show new tab
    document.getElementById(tabId).style.display = 'block';
    document.getElementById(tabId + '_tab').className = 'tab selectedTab';
    
    // Update hidden value
    hiddenField.value = tabId;     
}