det='0';

function nahled(co_obr,form){
	sirka=200;
	vyska=300;

	ns4up = (document.layers) ? 1 : 0;
	ie4up = (document.all && document.all.toString().substring(0,7)=='[object') ? 1 : 0;
	ns6up = (document.getElementById&&!document.all) ? 1 : 0;
	
	scWid = screen.width;
	scHei = screen.height;
	scrol = 'no';
	
	res=(ie4up||ns6up) ? 'yes' : 'yes';
	
	pos_x = (screen.width - (sirka+12))/2;
	pos_y = (screen.height - (vyska+29))/2;
	
	while(co_obr.indexOf('/')>0){
		co_obr=co_obr.substring(0,co_obr.indexOf('/'))+'__'+co_obr.substring(co_obr.indexOf('/')+1);
	}
	det = window.open('zoom.html?'+co_obr,'foto','width=' + (sirka) + ',height=' + (vyska) + ',top='+pos_y+',left='+ pos_y +',scrollbars='+scrol+',resizable='+res+',statusbar=no,dependent=yes');
}