function compFooter(){
//vypocet vysky zapati
// var mainHeight = (document.getElementById("header").offsetHeight+document.getElementById("obsah").offsetHeight);

// var clientHeight = document.body.parentNode.clientHeight;
// var footerHeight = clientHeight-mainHeight;
// var footerBHeight = document.getElementById("footer_b").offsetHeight;
// 
// if((mainHeight+footerBHeight) < clientHeight){
// 	document.getElementById("footer_box_a").style.height = footerHeight+'px';
// 	//document.getElementById("footer_box_b").style.height = footerHeight+'px';
// 	document.getElementById("footer_box_c").style.height = document.body.offsetHeight+footerHeight+'px';
// } else {
// 	document.getElementById("footer_box_c").style.height = document.body.offsetHeight+document.getElementById("footer_box_a").offsetHeight+'px';
// }

//vypocet sirky prvku v zapati
var clientWidth = document.body.clientWidth;
var widthBoxA = 880;
var widthBoxB = 0;
var widthBoxC = 0; //dopocitava se;

if(clientWidth <= (widthBoxA+widthBoxB)){
	document.getElementById("footer_box_c").style.display = "none";
} else {
	document.getElementById("footer_box_c").style.width = (clientWidth-(widthBoxA+widthBoxB))+'px';
}
	//this.window.alert(document.body.offsetHeight+footerHeight+'px');
}