var bg_img_faktor = false;

function resizeBgImg() {
	var vp = getViewportSize();
	
	if( (vp.width/vp.height) < bg_img_faktor) {
		var new_w = Math.round(vp.height*bg_img_faktor);
		var new_h = Math.round(vp.height);
	} else {
		var new_w = Math.round(vp.width);
		var new_h = Math.round(vp.width/bg_img_faktor);
	}
	if(isFinite(new_w) && isFinite(new_h) ) {			
		$('bg_img').style.width		= new_w +"px";
		$('bg_img').style.height	= new_h +"px";
	}
}


function getViewportSize() {
	var x,y;
	if (self.innerHeight) // all except Explorer
	{
		x = self.innerWidth;
		y = self.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight)
		// Explorer 6 Strict Mode
	{
		x = document.documentElement.clientWidth;
		y = document.documentElement.clientHeight;
	}
	else if (document.body) // other Explorers
	{
		x = document.body.clientWidth;
		y = document.body.clientHeight;
	}
	
	return {width:x,height:y};
}


function getImageFactor(url) {
	var img = document.createElement("img");
	img.src = url;
	document.getElementsByTagName('body')[0].appendChild(img);
	
	bg_img_faktor =  img.width / img.height; 
	img.parentNode.removeChild(img);
	
	return true;
}


function start() {
	if( resizeBgImg && $('bg_img') && navigator.userAgent.search(/MSIE 7/) == -1 && navigator.userAgent.search(/Firefox/) == -1) {
		getImageFactor( $('bg_img').src );
		Event.observe(window, 'resize', resizeBgImg);
		resizeBgImg();
	}
}


function changeButton(obj) {
	if( obj.tagName.toLowerCase() != 'a')	return false;
	
	var img_obj = obj.firstChild;
	if(!img_obj || img_obj.tagName.toLowerCase() != 'img')	return false;
	
	
	if(img_obj.oldSrc) {
		img_obj.src 	= img_obj.oldSrc;
		img_obj.oldSrc 	= false;
	} else {
		img_obj.oldSrc 	= img_obj.src;
		img_obj.src 	= img_obj.src.substr(0,img_obj.src.length-6) +"_2.gif";
	}
	
	return true;
}



function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}




function do_debug(obj) {
	var out = "";
	for(var a in obj) {
		out += a +"="+ obj[a] +"\n";
	}
	alert(out);
}

function showSearchPopup() {
	var obj = document.getElementById('search_box_popup');
	if(obj) {
		obj.style.display='block';
	}
}