function viewPort() {
	var h = window.innerHeight || document.documentElement.clientHeight || document.getElementsByTagName('body')[0].clientHeight;
	var w = window.innerWidth || document.documentElement.clientWidth || document.getElementsByTagName('body')[0].clientWidth;

	return { width : w , height : h }
}

function isIE6() {
	var nVer = navigator.appVersion;
	var nAgt = navigator.userAgent;
	var browserName  = navigator.appName;
	var fullVersion  = ''+parseFloat(navigator.appVersion); 
	var majorVersion = parseInt(navigator.appVersion,10);
	var nameOffset,verOffset,ix;
	
	// In MSIE, the true version is after "MSIE" in userAgent
	if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
	 browserName = "Microsoft Internet Explorer";
	 fullVersion = nAgt.substring(verOffset+5);
	}
	// In Opera, the true version is after "Opera" 
	else if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
	 browserName = "Opera";
	 fullVersion = nAgt.substring(verOffset+6);
	}
	// In Chrome, the true version is after "Chrome" 
	else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) {
	 browserName = "Chrome";
	 fullVersion = nAgt.substring(verOffset+7);
	}
	// In Safari, the true version is after "Safari" 
	else if ((verOffset=nAgt.indexOf("Safari"))!=-1) {
	 browserName = "Safari";
	 fullVersion = nAgt.substring(verOffset+7);
	}
	// In Firefox, the true version is after "Firefox" 
	else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) {
	 browserName = "Firefox";
	 fullVersion = nAgt.substring(verOffset+8);
	}
	// In most other browsers, "name/version" is at the end of userAgent 
	else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) < (verOffset=nAgt.lastIndexOf('/')) ) 
	{
	 browserName = nAgt.substring(nameOffset,verOffset);
	 fullVersion = nAgt.substring(verOffset+1);
	 if (browserName.toLowerCase()==browserName.toUpperCase()) {
	  browserName = navigator.appName;
	 }
	}
	// trim the fullVersion string at semicolon/space if present
	if ((ix=fullVersion.indexOf(";"))!=-1) fullVersion=fullVersion.substring(0,ix);
	if ((ix=fullVersion.indexOf(" "))!=-1) fullVersion=fullVersion.substring(0,ix);
	
	majorVersion = parseInt(''+fullVersion,10);
	if (isNaN(majorVersion)) {
	 fullVersion  = ''+parseFloat(navigator.appVersion); 
	 majorVersion = parseInt(navigator.appVersion,10);
	}

	if ((browserName=="Microsoft Internet Explorer") && (majorVersion<7)) {
		return true;
	} else {
		return false;
	}
}

function switchView() {
	var mode=(viewPort().height>700)?"normal":"scroll";

	var headlineDiv = document.getElementsByTagName('nav')[0];

	if (mode=="scroll") {
		headlineDiv.style.position='absolute';
	} else {
		headlineDiv.style.position='fixed';
	}
}