var win;

function closewin(){
if(win && win.open && !win.closed){
win.close();
}
}

function openwin(numwin){
win = open(numwin + '.htm','new','width=500,height=375');	
win.document.close();
win.focus();
}

function openwinlong(numwin){
win = open(numwin + '.htm','new','width=281,height=375');	
win.document.close();
win.focus();
}

function openwinsmall(numwin){
win = open(numwin + '.htm','new','width=300,height=225');	
win.document.close();
win.focus();
}