function roll_over(this_item,other_item1,other_item2,other_item3,other_item4,id,id_remove1,id_remove2,id_remove3,id_remove4){
document.getElementById(this_item).style.backgroundImage="";
document.getElementById(this_item).style.cursor="pointer";
document.getElementById(other_item1).style.backgroundImage="url(css/blank_p.gif)";
document.getElementById(other_item2).style.backgroundImage="url(css/blank_p.gif)";
document.getElementById(other_item3).style.backgroundImage="url(css/blank_p.gif)";
document.getElementById(other_item4).style.backgroundImage="url(css/blank_p.gif)";

document.getElementById(id).style.visibility ="visible";
document.getElementById(id).style.display="inline";

document.getElementById(id_remove1).style.display="none";
document.getElementById(id_remove2).style.display="none"; 
document.getElementById(id_remove3).style.display="none";
document.getElementById(id_remove4).style.display="none";
document.getElementById(id_remove1).style.visibility ="hidden";    
document.getElementById(id_remove2).style.visibility ="hidden";
document.getElementById(id_remove3).style.visibility ="hidden";
document.getElementById(id_remove4).style.visibility ="hidden";
}

function get_lost(){
document.getElementById('submenu_1').style.display="none";
document.getElementById('submenu_2').style.display="none"; 
document.getElementById('submenu_3').style.display="none";
document.getElementById('submenu_4').style.display="none";
document.getElementById('submenu_5').style.display="none";
}