function trim(str){
	while (str.substring(0,1) == ' '){
		str = str.substring(1,str.length);
	}
	while (str.substring(str.length-1,str.length) == ' '){
		str = str.substring(0,str.length-1);
	}
	return str;
}
function checkForm(form){
	if (trim(form.fraza.value)==''){
		//
		form.fraza.focus();
		return false;
	}
}
function changePhoto(nazwa){
	
	document.getElementById("big_photo").innerHTML="<img style='max-width:300px;max-height:300px' src='products/"+nazwa+"' />";
}