function select_deselectAll (chkVal, idVal) 
{ 
    debugger
    var frm = document.forms[0];
    // Loop through all elements
    for (i=0; i<frm.length; i++) 
    {
        // Look for our Header Template's Checkbox
        if (idVal.indexOf ('CheckAll') != -1)
        {
            // Check if main checkbox is checked, then select or deselect datagrid checkboxes 
            if(chkVal == true) 
            {
                if(frm.elements[i].disabled == false)
                {
					        frm.elements[i].checked = true;
				        }
				        else
                {
					frm.elements[i].checked = false;
				}
			} 
            else 
            {
                frm.elements[i].checked = false;
            }
            // Work here with the Item Template's multiple checkboxes
        } 
        else if (idVal.indexOf ('DeleteThis') != -1) 
        {
            // Check if any of the checkboxes are not checked, and then uncheck top select all checkbox
            if(frm.elements[i].checked == false) 
            {
                frm.elements[1].checked = false; //Uncheck main select all checkbox
            }
        }
    }

}