function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != "function") {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent( function(){ add_print_link( "content_container" ) } );

function add_print_link( id ){
  if( !document.getElementById ||
      !document.getElementById( id ) ) return;

  // add extra functions to page tools list
  var print_page = document.getElementById( id );

  // create print link
  var print_function = document.createElement("p");
  print_function.className = "print-link";
  print_function.onclick = function(){ print_preview(); return false; };
  print_function.appendChild( document.createTextNode( "Print the Page" ) );

}

function print_preview() {
	// Switch the stylesheet
	setActiveStyleSheet("Print Preview");
	
	// Create preview message
	add_preview_message();

	// Print the page
	window.print();
}

function add_preview_message(){
var main_content = document.getElementById( "content_container" );
var main_body = main_content.parentNode;

	if (document.getElementById){
		
		var preview_message = document.createElement("div");
		preview_message.id = "preview-message";

			// Create Heading
		var preview_header = document.createElement("h3");
		var preview_header_text = document.createTextNode('');
		preview_header.appendChild(preview_header_text);
		
		// Create paragraph
		var preview_para = document.createElement("p");
		var preview_para_text = document.createTextNode('');
	

		
		var cancel_function_link = document.createElement("a");
			cancel_function_link.onclick = function(){ cancel_print_preview(); return false; };
			cancel_function_link.setAttribute("href", "#");	
		var cancel_function_link_text = document.createTextNode("<< Back to Normal View");
		cancel_function_link.appendChild(cancel_function_link_text);
		preview_para.appendChild(preview_para_text); //
		preview_para.appendChild(cancel_function_link);
		
		// Put it all together
		preview_message.appendChild(preview_header); 
		preview_message.appendChild(preview_para);
		main_body.insertBefore(preview_message, main_content);

	}
}

function cancel_print_preview() {
	// Destroy the preview message
	var print_preview = document.getElementById("preview-message");
	var main_body = print_preview.parentNode;
	main_body.removeChild(print_preview);
	
	// Switch back stylesheet
	setActiveStyleSheet("default");
}

function setActiveStyleSheet(title) {
   var i, a, main;
   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("title")) {
       a.disabled = true;
       if(a.getAttribute("title") == title) a.disabled = false;
     }
   }
}