// JavaScript Document

function addLoadEvent (func) {

  var oldonload = window.onload;

  if (typeof window.onload != 'function') {

    window.onload = func;

  } else {

    window.onload = function() {

      if (oldonload) {

        oldonload();

      }

      func();

    }

  }

}



function showRollOverEffect() {



	if (!document.getElementById) return 



	var navPrimaryTv = document.getElementById("nav-primary-tv");

	var navPrimaryVideo = document.getElementById("nav-primary-video");		

	var navPrimaryIndustry = document.getElementById("nav-primary-industry");

	var navPrimaryCase = document.getElementById("nav-primary-case");

	

	navPrimaryTv.onmouseover = showPrimaryTv;

	navPrimaryVideo.onmouseover = showPrimaryVideo;

	navPrimaryIndustry.onmouseover = showPrimaryIndustry;

	navPrimaryCase.onmouseover = showPrimaryCase;

	

	navPrimaryTv.onmouseout = hideAll;

	navPrimaryVideo.onmouseout = hideAll;

	navPrimaryIndustry.onmouseout = hideAll;

	navPrimaryCase.onmouseout = hideAll;

	

	function showPrimaryTv() {

		navPrimaryTv.style.background = 'url(/assets/img/nav-primary-tv.png)';

	}

	function showPrimaryVideo() {

		navPrimaryVideo.style.background = 'url(/assets/img/nav-primary-video.png)';

	}

	function showPrimaryIndustry() {

		navPrimaryIndustry.style.background = 'url(/assets/img/nav-primary-industry.png)';

	}

	function showPrimaryCase() {

		navPrimaryCase.style.background = 'url(/assets/img/nav-primary-case.png)';

	}



	function hideAll() {

		navPrimaryTv.style.background = '';

		navPrimaryVideo.style.background = '';

		navPrimaryIndustry.style.background = '';

		navPrimaryCase.style.background = '';

	}

}

addLoadEvent(showRollOverEffect);