is_search_engine=false
referrer=decodeURIComponent(document.referrer)
if(referrer !=''){
if(referrer.match(/^http:\/\/(www\.?)google.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/search\.yahoo.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/search\.msn.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/search\.live.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/pesquisa\.sapo.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/altavista.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/busca\.uol.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/buscador\.terra.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/busca\.igbusca.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/(br\.)?answers\.yahoo\.com.*/i)){
is_search_engine=true
}else if(referrer.match(/^http:\/\/(www\.)?bing.*/i)){
is_search_engine=true}}
if(is_search_engine){
document.getElementById("mkttop").style.display="block"}