var mx=-10;
var my=-10;

if (document.images) {

  var svc_off = new Image();
  var svc_on  = new Image();

  svc_off.src = "images/transp.gif";
  svc_on.src  = "images/menubox_on.gif";

}


function svcD(imageID) {         // big grey electical boxes
        //
        // takes one args:      imageID         the  NAME  value
  	//
	// - clears all other 7 of 8 choices
	//

  if (!document.images) { return false; }

  var source_off = "svc_off.src";
  if (eval(source_off) == "") { postload(); }   // event before  postload1()  ?

  // hide all the images and the layers
  document['svc1'].src = eval(source_off);
  document['svc2'].src = eval(source_off);
  document['svc3'].src = eval(source_off);
  document['svc4'].src = eval(source_off);
  document['svc5'].src = eval(source_off);
  document['svc6'].src = eval(source_off);
  document['svc7'].src = eval(source_off);
  document['svc8'].src = eval(source_off);

  var target = "svc" + imageID;
  var source = "svc_on.src";

  if (eval(source) == "") { postload(); }   // event before  postload1()  ?
  document[target].src = eval(source);

  if (!document.all && document.getElementById) {         // NS6

	//obj = document.getElementById("svc0D");
	//mx = obj.style.left;
	//my = obj.style.top;
	//alert("style: " + mx + " " + my);
	//obj.style.left = obj.style.left + 20; 
	//obj.style.top = obj.style.top + 20; 

	obj = document.getElementById("svc1D");
	obj.style.visibility = "hidden";
	obj = document.getElementById("svc2D");
	obj.style.visibility = "hidden";
	obj = document.getElementById("svc3D");
	obj.style.visibility = "hidden";
	obj = document.getElementById("svc4D");
	obj.style.visibility = "hidden";
	obj = document.getElementById("svc5D");
	obj.style.visibility = "hidden";
	obj = document.getElementById("svc6D");
	obj.style.visibility = "hidden";
	obj = document.getElementById("svc7D");
	obj.style.visibility = "hidden";
	obj = document.getElementById("svc8D");
	obj.style.visibility = "hidden";

	myobj = "svc" + imageID + "D";
	obj = document.getElementById(myobj);
	obj.style.visibility = "visible";

  } else if (whoami.indexOf('MSIE')==-1) {

	//obj = eval("document.svc0D");
	//mx = obj.pageX;
	//my = obj.pageY;
	//alert("page: " + mx + " " + my);

	obj = eval("document.svc1D");                    // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.svc2D");                    // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.svc3D");                    // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.svc4D");                    // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.svc5D");                    // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.svc6D");                    // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.svc7D");                    // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.svc8D");                    // current drop menu
	obj.visibility = 'hidden';

	obj = eval("document.svc"+imageID+"D");                    // current drop menu
	obj.visibility = 'visible';
  } else if (document.all) {				// older IE ?

	//obj = eval("document.all.svc0D");
	//mx = obj.pixelLeft;
	//my = obj.pixelTop;
	//alert("pixel: " + mx + " " + my);

	obj = eval("document.all.svc1D.style");       // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.all.svc2D.style");       // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.all.svc3D.style");       // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.all.svc4D.style");       // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.all.svc5D.style");       // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.all.svc6D.style");       // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.all.svc7D.style");       // current drop menu
	obj.visibility = 'hidden';
	obj = eval("document.all.svc8D.style");       // current drop menu
	obj.visibility = 'hidden';

	obj = eval("document.all.svc"+imageID+"D.style");       // current drop menu
	obj.visibility = 'visible';
  }

  return true;
}