function goto(mmain) {
    //alert(mmain);
   if (mmain==0) { window.open("home.phtml","_self"); }
   if (mmain==01) { window.open("about_us.phtml","_self"); }
   if (mmain==02) { window.open("product.phtml","_self"); }  
   if (mmain==03) { window.open("service.phtml","_self"); }  
   if (mmain==04) { window.open("news.phtml","_self"); }  
   if (mmain==05) { window.open("contact_us.phtml","_self"); }   
}