function show_tab (tab) {
	i=1;
    document.getElementById("stab").value = tab;
        for(var i=1;i<=10;i++) {
	//while (document.getElementById("g_"+i)) {
		if (document.getElementById("g_"+i) && i==tab) {
			document.getElementById("g_"+i).style.display = "block";
			if (document.getElementById("a_"+i)) document.getElementById("a_"+i).className = "active"
		} else {
                   if(document.getElementById("g_"+i)) {
			document.getElementById("g_"+i).style.display = "none";
			if (document.getElementById("a_"+i)) document.getElementById("a_"+i).className = ""
                   }
		}
		//i++
	}
return false;
}