function changeguide(){

document.frmMain.action = document.getElementById('carvideoid').value;


index = 0;
result = 0;
  while(index < document.frmMain.carvideo.length)
    if(document.frmMain.carvideo[index].value == document.getElementById('carvideoid').value){
      result = index;
      index++;
    }else{
      index++;
	}


document.getElementById('carvideoid').selectedIndex = result;


}