🚀 go-pugleaf

Witam
Wyskakuje mi coś takiego:
"Nie znaleziono członka grupy"

function imgchange()
	{
var siB =  document.ncs.B.selectedIndex;
var v1 = document.ncs.B.options[siB].value

var siH = document.ncs.H.selectedIndex;
var v2 = document.ncs.H.options[siH].value

var siC = document.ncs.C.selectedIndex;
var v3 = document.ncs.C.options[siC].value

document.tlo.src = v1+".gif"
document.img.style = "Filter:Alpha(Opacity="+v2+")"
document.img.src = v3+".gif"
}

</SCRIPT>

<img class="bc" src="S10.gif" width="500" height="500" name="tlo">
<img style="Filter:Alpha(Opacity=10)" src="Y10R.gif" width="500"
height="500" name="img">
<FORM name="ncs">
<SELECT NAME="B" size=1>
	<OPTION VALUE="x10">10</OPTION>
	<OPTION VALUE="x20">20</OPTION>
	<OPTION VALUE="x30">30</OPTION>
</SELECT>

<SELECT NAME="H" size=1>
	<OPTION VALUE="10">10</OPTION>
	<OPTION VALUE="20">20</OPTION>
	<OPTION VALUE="30">30</OPTION>
</SELECT>
-
<SELECT NAME="C" size=1>
	<OPTION VALUE="y10">10</OPTION>
	<OPTION VALUE="y20">20</OPTION>
	<OPTION VALUE="y30">30</OPTION>
</SELECT>

<INPUT type="button" value="SZUKAJ" onClick="imgchange()">
</FORM>

Co z tym zrobić? HELP