var currentDiv = 1;
var countDiv = 3;

function hideAllDivs() {
	for (i=1; i<=countDiv; i++) {
		document.getElementById(i).style.display='none';
	}
}

function showDiv(divID) {
	hideAllDivs();
	document.getElementById(divID).style.display='block';
	currentDiv = divID;
}

function zaloba() {
	if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)) {
	    document.body.style.filter='gray()' }
	else
//	    grayscale.prepare(document.getElementsByTagName('body'));
	    grayscale(document.getElementsByTagName('body'));
}