back_img = new Image();back_img.src = "http://www.operamacabre.com/images/back2.gif";function add_back_button (){ 	document.write ("<img name='back_img' src='http://www.operamacabre.com/images/back.gif' title='Return to previous window'");	document.write (" onmouseover=\"window.status='Return to previous window';back_img.src='http://www.operamacabre.com/images/back2.gif';\"");	document.write (" onmouseout=\"window.status='Done';back_img.src='http://www.operamacabre.com/images/back.gif';\"");	document.write ("onClick=\"history.go(-1);\">");}