function decision(message, url){
	if(confirm(message)) location.href = url;
}

function openPrintWindow (url,window_name,parameters){
	window.open(url,window_name,parameters);
}

function randonBackground(){
	var ran_number= (Math.floor(Math.random()*6) + 1); 
	document.body.style.backgroundImage = "url('background_images/image_"+ran_number+".jpg')";
}