$(document).ready(function()

{

	setOverlayProperties();

	initTabListener();

	initDropdownListener();

});



function setOverlayProperties()

{

	var arrPageSizes = getPageSize();

	$('#overlay').css("opacity", "0.5");

	$('#overlay').css("width", arrayPageSize[0]);

	$('#overlay').css("height", arrayPageSize[1]);

}



function initTabListener()

{

	$("#infoleiste").find("a").hover(

		function(){

			$(this).css("background-position", "right -24px");

			$(this).parent().css("background-position", "left -24px");

		},

		function(){

			$(this).css("background-position", "right top");

			$(this).parent().css("background-position", "left top");

		}	

	);

}



function initDropdownListener()

{

    $('#rechnerBtn').toggle(

      function(){

      	$('#rechnerContent').slideDown("slow");

      	$('#rechnerBtn').css("background-position", "left -24px");

      	$('#overlay').fadeIn();

      	$('#bottomText').css("visibility", "hidden");

      	

      },

      function(){

      	$('#rechnerContent').slideUp("slow",function(){

      		$('#bottomText').css("visibility", "visible");

      	});

      	$('#rechnerBtn').css("background-position", "left 0px");

      	$('#overlay').fadeOut();

      }

    );

}





/**

 * getPageSize() by quirksmode.com

 *

 * @return Array Return an array with page width, height and window width, height

 */

function getPageSize()

{

    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;

    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;

    }

    // for small pages with total width less then width of the viewport

    if (xScroll < windowWidth) {

        pageWidth = xScroll;

    }

    else {

        pageWidth = windowWidth;

    }

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

    return arrayPageSize;

};