function getQueryVariable() {
 var query = window.location.search.substring(1);  
 var vars = query.split("&");
 var arr = new Array(); 
for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
       arr[pair[0]] = pair[1];
  }
 return arr;
}

pars = getQueryVariable();
if (window.location.pathname == '/Guestbook/Messages.aspx' && pars['topic'] == 1157){
	var tds = document.getElementsByTagName('td');
	for (var i=0;i<tds.length;i++)
	{
		if (tds[i].bgColor = "#0d3b00") tds[i].bgColor = "#000000";
	}
}