for(a=1;a<=20;a++){
  eval('m'+a+'_on = new Image()');
  eval('m'+a+'_off = new Image()');
  eval('m'+a+'_on.src = \"../image/menu0'+a+'_o.gif\"');
  eval('m'+a+'_off.src = \"../image/menu0'+a+'.gif\"');
}

function changem(num,tog){
  eval("document.m"+num+".src=m"+num+"_"+tog+".src");
}

function MM_showHideLayers() { //v2.0
  var i, visStr, args, theObj;
  args = MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) { //with arg triples (objNS,objIE,visStr)
    visStr   = args[i+2];
    if (navigator.appName == 'Netscape' && document.layers != null) {
      theObj = eval(args[i]);
      if (theObj) theObj.visibility = visStr;
    } else if (document.all != null) { //IE
      if (visStr == 'show') visStr = 'visible'; //convert vals
      if (visStr == 'hide') visStr = 'hidden';
      theObj = eval(args[i+1]);
      if (theObj) theObj.style.visibility = visStr;
  } }
}


function menu1on() {changem('1','on');MM_showHideLayers('document.layers[\'Layer1\']','document.all[\'Layer1\']','show');}
function menu2on() {changem('2','on');MM_showHideLayers('document.layers[\'Layer2\']','document.all[\'Layer2\']','show');}
function menu3on() {changem('3','on');MM_showHideLayers('document.layers[\'Layer3\']','document.all[\'Layer3\']','show');}
function menu4on() {changem('4','on');MM_showHideLayers('document.layers[\'Layer4\']','document.all[\'Layer4\']','show');}
function menu5on() {changem('5','on');MM_showHideLayers('document.layers[\'Layer5\']','document.all[\'Layer5\']','show');}
function menu6on() {changem('6','on');MM_showHideLayers('document.layers[\'Layer6\']','document.all[\'Layer6\']','show');}
function menu7on() {changem('7','on');MM_showHideLayers('document.layers[\'Layer7\']','document.all[\'Layer7\']','show');}
function menu8on() {changem('8','on');MM_showHideLayers('document.layers[\'Layer8\']','document.all[\'Layer8\']','show');}
function menu9on() {changem('9','on');MM_showHideLayers('document.layers[\'Layer9\']','document.all[\'Layer9\']','show');}
function menu10on() {changem('10','on');MM_showHideLayers('document.layers[\'Layer10\']','document.all[\'Layer10\']','show');}

function menu1off() {changem('1','off');MM_showHideLayers('document.layers[\'Layer1\']','document.all[\'Layer1\']','hide');}
function menu2off() {changem('2','off');MM_showHideLayers('document.layers[\'Layer2\']','document.all[\'Layer2\']','hide');}
function menu3off() {changem('3','off');MM_showHideLayers('document.layers[\'Layer3\']','document.all[\'Layer3\']','hide');}
function menu4off() {changem('4','off');MM_showHideLayers('document.layers[\'Layer4\']','document.all[\'Layer4\']','hide');}
function menu5off() {changem('5','off');MM_showHideLayers('document.layers[\'Layer5\']','document.all[\'Layer5\']','hide');}
function menu6off() {changem('6','off');MM_showHideLayers('document.layers[\'Layer6\']','document.all[\'Layer6\']','hide');}
function menu7off() {changem('7','off');MM_showHideLayers('document.layers[\'Layer7\']','document.all[\'Layer7\']','hide');}
function menu8off() {changem('8','off');MM_showHideLayers('document.layers[\'Layer8\']','document.all[\'Layer8\']','hide');}
function menu9off() {changem('9','off');MM_showHideLayers('document.layers[\'Layer9\']','document.all[\'Layer9\']','hide');}

function mu4on() {changem('4','on');changem('5','off');changem('6','off');changem('7','off');changem('8','off');changem('9','off');javascript:menu4on();javascript:menu5off();javascript:menu6off();javascript:menu7off();javascript:menu8off();javascript:menu9off();}
function mu5on() {changem('5','on');changem('4','off');changem('6','off');changem('7','off');changem('8','off');changem('9','off');javascript:menu5on();javascript:menu4off();javascript:menu6off();javascript:menu7off();javascript:menu8off();javascript:menu9off();}
function mu6on() {changem('6','on');changem('4','off');changem('5','off');changem('7','off');changem('8','off');changem('9','off');javascript:menu6on();javascript:menu4off();javascript:menu5off();javascript:menu7off();javascript:menu8off();javascript:menu9off();}
function mu7on() {changem('7','on');changem('4','off');changem('5','off');changem('6','off');changem('8','off');changem('9','off');javascript:menu7on();javascript:menu4off();javascript:menu5off();javascript:menu6off();javascript:menu8off();javascript:menu9off();}
function mu8on() {changem('8','on');changem('4','off');changem('5','off');changem('6','off');changem('7','off');changem('9','off');javascript:menu8on();javascript:menu4off();javascript:menu5off();javascript:menu6off();javascript:menu7off();javascript:menu9off();}
function mu9on() {changem('9','on');changem('4','off');changem('5','off');changem('6','off');changem('7','off');changem('8','off');javascript:menu8on();javascript:menu4off();javascript:menu5off();javascript:menu6off();javascript:menu7off();javascript:menu8off();}

function mu4off() {changem('4','on');changem('5','off');changem('6','off');changem('7','off');changem('8','off');changem('9','off');javascript:menu4on();javascript:menu5off();javascript:menu6off();javascript:menu7off();javascript:menu8off();javascript:menu9off();}
function mu5off() {changem('5','on');changem('4','off');changem('6','off');changem('7','off');changem('8','off');changem('9','off');javascript:menu5on();javascript:menu4off();javascript:menu6off();javascript:menu7off();javascript:menu8off();javascript:menu9off();}
function mu6off() {changem('6','on');changem('4','off');changem('5','off');changem('7','off');changem('8','off');changem('9','off');javascript:menu6on();javascript:menu4off();javascript:menu5off();javascript:menu7off();javascript:menu8off();javascript:menu9off();}
function mu7off() {changem('7','on');changem('4','off');changem('5','off');changem('6','off');changem('8','off');changem('9','off');javascript:menu7on();javascript:menu4off();javascript:menu5off();javascript:menu6off();javascript:menu8off();javascript:menu9off();}
function mu8off() {changem('8','on');changem('4','off');changem('5','off');changem('6','off');changem('7','off');changem('9','off');javascript:menu8on();javascript:menu4off();javascript:menu5off();javascript:menu6off();javascript:menu7off();javascript:menu9off();}
function mu9off() {changem('9','on');changem('4','off');changem('5','off');changem('6','off');changem('7','off');changem('8','off');javascript:menu9on();javascript:menu4off();javascript:menu5off();javascript:menu6off();javascript:menu7off();javascript:menu8off();}

<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->


function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function goMenu(Value,combo)
{
	   combo.value = '';
	   if(Value == "5")  window.open("http://gctweb.gctsemi.com/bbs/bbs_faq.htm?bid=1010",'pop','scrollbars=yes,width=576,height=512,left=100,top=100');
       else if(Value == "6") window.open("http://gctweb.gctsemi.com/bbs/bbs_faq.htm?bid=1020",'pop','scrollbars=yes,width=576,height=512,left=100,top=100');
       else if(Value == "7") window.open("http://gctweb.gctsemi.com/bbs/bbs_faq.htm?bid=1030",'pop','scrollbars=yes,width=576,height=512,left=100,top=100');
       else if(Value == "8") window.open("http://gctweb.gctsemi.com/products/support.htm?bid=1100",'pop','width=563,height=638');
	   else location.href= Value;
}