function show (id) {
  if (document.getElementById(id))
    document.getElementById(id).style.visibility = "visible";
}

function hide (id) {
  if (document.getElementById(id))
    document.getElementById(id).style.visibility = "hidden";
}

// JavaScript Document
/*JavaScript*/
function showPopUp(id) {
	if (document.getElementById(id))
		document.getElementById(id).style.visibility = "visible";
	hideGray();
}

function hidePopUp(id) {
	if (document.getElementById(id))
		document.getElementById(id).style.visibility = "hidden";
	grayAway();
}

function hideGray() {		
		c0verElement = document.createElement("div");
		c0verElement.id = "c0ver";
	
		c0verElement.className = "deckschicht";
		
		var arrayPageSize = getPageSizeBoe();
		c0verElement.style.width = arrayPageSize[0] + "px";
		c0verElement.style.height = arrayPageSize[1] + "px";

		document.getElementsByTagName("body")[0].appendChild(c0verElement);		
}

function grayAway() {		
		document.getElementById("c0ver").style.width = "1px";
		document.getElementById("c0ver").style.height = "1px";
		rEs(document.getElementById('c0ver'));
}

function rEs(tO) { var i, n; if (!tO) { return false; }
  if (!tO.nodeName) { if (tO.length) for (n=tO.length; n--;) rEs(tO[n]); }
  else tO.parentNode.removeChild(tO);
}


//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.com
// Edit for Firefox by pHaez
//
function getPageSizeBoe(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	
//	console.log(self.innerWidth);
//	console.log(document.documentElement.clientWidth);

	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

//	console.log("xScroll " + xScroll)
//	console.log("windowWidth " + windowWidth)

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}
//	console.log("pageWidth " + pageWidth)

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}