function start_show(cur){
document.show.current.value=cur;

var op5 = (navigator.userAgent.indexOf("Opera 5")!=-1)
             || (navigator.userAgent.indexOf("Opera/5")!=-1);

if(!op5){window.open('','ShowUp','height=460,width=460,toolbar=0,resizable=1,scrollbars=0');}
     else{window.open('','ShowUp','height=490,width=490,toolbar=0,resizable=1,scrollbars=0');}

document.show.submit();   
}