var x, y, vrsek, levo, vlevo
x = 3/4*screen.width
y = 3/4*screen.height

vrsek = screen.height-screen.availHeight
levo = 1/8*screen.width
vlevo = screen.width/2

prodej = new Image()
prodej.src = "obr/prodej_z1.png"
distribuce = new Image()
distribuce.src = "obr/distribuce_m1.jpg"

function foto(filename, x, y) {
	var k = 8/10, xn, yn, xs=screen.width, ys=screen.height;
		if((x >= xs)  &&  (y >= ys)) { 
		    if(ys*x/y > xs) {
			xn = xs*k;
			yn = xn*y/x;
		    }else {
			yn = ys*k;
			xn=yn*x/y;
		    }
		} 
		if((x >= xs)  &&  (y < ys)) {
		    xn = xs*k;
		    yn = xn*y/x;
		} 
		if((x < xs)  &&  (y >= ys)) {
		    yn = ys*k;
		    xn = yn*x/y;
		} 
		if((x < xs)  &&  (y < ys)) {
		    yn=y;
		    xn=x;
		}
		MyPicture=window.open('', 'newwin','width='+(xn+20)+', height='+(yn+20)+', top='+vrsek+', left='+levo);
		MyPicture.document.writeln(
		  '<html><head><title>'+filename+'</title></head>'
 	+'<SCRIPT language=\"JavaScript\"> self.resizeTo('+(xn+32)+', '+(yn+71)+'); </SCRIPT>'
 	+'<CENTER><A href='+filename+' OnClick=\"window.close()\"><img src=\''+filename+'\' width='+(xn)+' height='+(yn)+' border=0></A></CENTER>'
	+'</body></html>'
	)
MyPicture.document.close();
}

function najdi()
{
 	if (fs1.stext.value == "")
	{
		alert('Musíte zadat dotaz');
		fs1.stext.focus();
		return false;
	}
}

function login_onsubmit()
{
	if (login.uzivatel.value == "")
	{
		alert('Musíte zadat přihlašovací jméno.');
		login.uzivatel.focus();
		return false;
	}
	if (login.heslo.value == "")
	{
		alert('Musíte zadat heslo.');
		login.heslo.focus();
		return false;
	}
	else
	{
		return true;
	}
}
