var previewMenu = ' \
 <div style="font-size:50%;">this shaded area will not be printed</div> \
 <b> \
  <a href="#" onclick="close_printBlockPreview();return(false);">CLOSE PREVIEW</a> \
  &nbsp;&nbsp;&nbsp; \
  <a href="#" onclick="print_printBlockPreview();return(false);">PRINT</a> \
 </b> \
';


function removePrintMenu()
{
 var div = document.getElementById('avision_previewMenu');
 if ( div) {
  document.body.removeChild(div);
 } else {
 }
}
function addPrintMenu()
{
 var div = document.getElementById('avision_previewMenu');
 if ( div) {
 } else {
  div = document.createElement('DIV');
  div.id = 'avision_previewMenu';
  div.innerHTML = previewMenu;
  div.className = "printpreviewmenu";
  div.style.margin = "0px";
  div.style.padding = "0px";
  document.body.insertBefore(div,document.body.firstChild);
 }
}

function removePrintHeader()
{
 var div = document.getElementById('avision_printHeader');
 if ( div) {
  document.body.removeChild(div);
 } else {
 }
}
function addPrintHeader()
{
 var div = document.getElementById('avision_printHeader');
 if ( div) {
 } else {
  div = document.createElement('DIV');
  div.id = 'avision_printHeader';
  div.innerHTML = AVisionPrintHeader;
  div.className = "print header";
  div.style.margin = "0px";
  div.style.padding = "0px";
  div.style.borderBottom = "1px solid #000";
  div.style.marginBottom = "0.5cm";
  div.style.height = "0.5cm";
  document.body.insertBefore(div,document.body.firstChild);
 }
}


var activeBlock = null;
var activeBlockClass = null;
function printBlock( blk)
{
 var ocn = blk.className;
 blk.className += " print";
 addPrintHeader();
 window.print();
 removePrintHeader();
 blk.className = ocn;
 activeBlock = null;
}

function close_printBlockPreview( blk)
{
 removePrintHeader();
 removePrintMenu();
 if ( !blk) blk = activeBlock;
 blk.className = activeBlockClass;
 switch_style( "print-preview", false);
 activeBlock = null;
}

function print_printBlockPreview( blk)
{
 if ( !blk) blk = activeBlock;
 close_printBlockPreview( blk);
 printBlock( blk);
}

function printBlockPreview( blk)
{
 addPrintHeader();
 addPrintMenu();
 switch_style( "print-preview", true);
 var ocn = blk.className;
 blk.className += " print";
 activeBlock = blk;
 activeBlockClass = ocn;

 document.body.onkeypress = function(e) {
  if ( !e) e = window.event;
  if ( e.keyCode == 27) {
   close_printBlockPreview();
   document.body.onkeypress = null;
  }
 }
}