function chtext (text) {

        var names=new Array('israel','usa','usa_1','britain','france','germany','italy','belgium','spain','sweden','switzerland','netherlands','greece','australia','singapore','indonesia','korea','japan','taiwan','china','india');

        var i=0;
        while(names[i]) {
            document.getElementById(names[i]).style.display='none';
            i++;
        }

        document.getElementById(text).style.display='block';
}

function chtext2(text) {

        var names=new Array('israel','usa','germany','britain','france','korea','japan');

        var i=0;
        while(names[i]) {
            document.getElementById(names[i]).style.display='none';
            i++;
        }

        document.getElementById(text).style.display='block';
}