var povWin = null;
function povecava( imgObj ) {
	bigImgSrc = imgObj.src.replace( /\/male/, '/velike/' );
	//alert("to: " + typeof povWin );
	if( povWin && povWin.closed==false ) povWin.close()
	
	var x1 = (screen.availWidth/2)-(50/2);
	var y1 = (screen.availHeight/2)-(50/2);
	
	povWin = window.open( "povecava.htm", "povecava", "left="+x1+",top="+y1+",width=50,height=50,scrollbars=0,status=0" );

	if( povWin.focus ) povWin.focus();
}