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('contain');
var main_body = contentDiv.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('This is a print preview of this page');
		preview_header.appendChild(preview_header_text);
		
		// Create paragraph
		var preview_para = document.createElement('p');	
		var preview_para_link = document.createElement('a'); 
			preview_para_link.onclick = function(){ window.print(); return false; };
			preview_para_link.setAttribute('href', '#');	
		var preview_para_text = document.createTextNode('Print');
		preview_para_link.appendChild(preview_para_text);
		
		var preview_para_space1 = document.createTextNode("\u00a0"); 
		var preview_para_space2 = document.createTextNode("\u00a0");
		var preview_para_space3 = document.createTextNode("\u00a0");
		
		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('Return to the existing page.');
		cancel_function_link.appendChild(cancel_function_link_text);
		preview_para.appendChild(preview_para_link); 
		preview_para.appendChild(preview_para_space1);
		preview_para.appendChild(preview_para_space2);
		preview_para.appendChild(preview_para_space3);
		preview_para.appendChild(cancel_function_link);
		
		// Put it all toegether
		preview_message.appendChild(preview_header); 
		preview_message.appendChild(preview_para);
		main_body.insertBefore(preview_message, contentDiv);
		
		

	}	
	

document.getElementById('preview-message').focus();	
	
	
}

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;
     }
   }
}