function loadPictureAnchors(){
	var a = document.getElementsByTagName('a');
	for(var i=0; i < a.length; i++){
		if(check(a[i]) == true){
			a[i].href = 'javascript:openWindow("'+a[i].href+'")';
		}
	}
}
function check(objRef){
	var povolene = new Array('pdf','jpg','gif','png','bmp','PDF','JPG','GIF','PNG','BMP');
	var href = objRef.href.split('.');
	
	for(var j=0; j < povolene.length; j++){
		if(povolene[j] == href[href.length-1]){
			return true;	
		}
	}
	return false;	
}
function openWindow(file){
	//zisti suradnicu horizon. stredu
	var dx= (window.screen.width-800)/2;
	//odcitaj velkost praveho scrollbaru
	dx -=20;
	//otvor nove okno zobraz subor v nom
	window.open(file,'viewPDF','width=800,height=800,left='+dx+',top=50,screenX='+dx+',screenY=50');
}