function setStyleVisibility(elid,visibility_status)
 {
  obj=document.getElementById(elid);
  obj.style.visibility=visibility_status;
 }

function setStyleVisibilityDisplay(elid,visibility_status,display_status)
 {
  obj=document.getElementById(elid);
  obj.style.visibility=visibility_status;
  obj.style.display=display_status;
 }

 
function setStyleDisplay(elid,display_status)
 {
  obj=document.getElementById(elid);
  obj.style.display=display_status;
 }

function switchStyleDisplay(elid,display_status)
 { // if none then display_status else none
  obj=document.getElementById(elid);
  obj.style.display=(obj.style.display=='none')?display_status:'none';
 }

  
function winopen(winname,winurl,oleft,otop,ww,hh,otoolbar)
 {
  winFeatures="height="+hh+", width="+ww+",left="+oleft+",top="+otop+",fullscreen=0,directories=0,location=0,menubar=0,resizable=1,scrollbars=1,status=0,titlebar=0,toolbar="+otoolbar;
  // alert(winFeatures);
  /*
  channelmode = { yes | no | 1 | 0 } Specifies whether to display the window in theater mode and show the channel band. The default is no. 
*/
  child=window.open(winurl,winname,winFeatures);
  child.focus();
 }