function openAWindow( pageToLoad, winName, width, height, center) {
  xposition=0; yposition=0;
  if ((parseInt(navigator.appVersion) >= 4 ) &&(center)) {
   xposition = (screen.width - width) / 2;
   yposition = (screen.height - height) / 2;
  }
  args = "width=" + width + ","
  + "height=" + height + ","
  + "location=0,"
  + "menubar=0,"
  + "resizable=0,"
  + "scrollbars=0,"
  + "status=0,"
  + "titlebar=0,"
  + "toolbar=0,"
  + "hotkeys=0,"
  + "screenx=" + xposition + "," //NN Only
  + "screeny=" + yposition + "," //NN Only
  + "left=" + xposition + "," //IE Only
  + "top=" + yposition; //IE Only
  window.open( pageToLoad, winName, args );
}

var array_menu = new Array('main','about','registration','events','newsg','contact');

function show(str) {
		for (key in array_menu)
		{
				if(document.layers){
					document.layers(array_menu[key]).visibility='hidden';
				}
				if(document.all){
					document.all(array_menu[key]).style.visibility='hidden';
				}
				if(!document.all && document.getElementById){
					document.getElementById(array_menu[key]).style.visibility="hidden";
				}
		}
				
		if(document.layers){
			document.layers(str).visibility='visible';
		}
		if(document.all){
			document.all(str).style.visibility='visible';
		}
		if(!document.all && document.getElementById){
			document.getElementById(str).style.visibility="visible";
		}
}

function no_show() {
		for (key in array_menu)
		{
				if(document.layers){
					if (array_menu[key]!='main') { document.layers(array_menu[key]).style.visibility='hidden'; }
				}
				if(document.all){
					if (array_menu[key]!='main') { document.all(array_menu[key]).style.visibility='hidden'; }
				}
				if(!document.all && document.getElementById){
					if (array_menu[key]!='main') { document.getElementById(array_menu[key]).style.visibility='hidden'; }
				}
		}
		
		if(document.layers){
			document.layers('main').visibility='visible';
		}
		if(document.all){
			document.all('main').style.visibility='visible';
		}
		if(!document.all && document.getElementById){
			document.getElementById('main').style.visibility="visible";
		}
}


function MM_findObj(n, d) { //v4.01
  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 && d.getElementById) x=d.getElementById(n); return x;
}