function changeImage()
{
	var ddl = document.forms[0].elements['ddl_images'];
	document.getElementById('img_preview').src = document.forms[0].elements['img_path'].value + "/" + ddl.options[ddl.selectedIndex].text;
}

function switchButton(buttonID,state) {
	document.getElementById("btn_"+buttonID).disabled = state;
	document.getElementById("ubtn_"+buttonID).disabled = state;
	if (state==true) {
		document.getElementById("btn_"+buttonID).onclick = new Function("return false;");
	}
	if (state==false) {
		document.getElementById("btn_"+buttonID).onclick = new Function("return true;");
	}
}

function checkOn(item_id)
{
  setChecks(item_id, true);
}

function checkOff(item_id)
{
  setChecks(item_id, false);
}

function setChecks(item_id, state)
{
 var ids = idlist[item_id];
 var arrIds = ids.split(',');
 for (var i=0; i < arrIds.length; i++)
 {
   var chk=document.getElementById('ch'+arrIds[i]);
   if (chk) 
   {
		chk.checked=state;
		CheckNode(arrIds[i]);
	}
 }
}