function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function menu(id) {
var element = document.getElementById(id);
	for (var i = 1; i<=5; i++) {
		if (document.getElementById('menu_'+i)) {document.getElementById('menu_'+i).style.display='none';}
	}
if (element) {element.style.display='block';}
}

function menu_sub(id){
	document.getElementById(id).style.display='none';
}

function OpacityOver(This){
	This.style.filter='alpha(opacity=70)';
	This.style.opacity='0.7';
}

function OpacityOut(This){
	This.style.filter='alpha(opacity=100)';
	This.style.opacity='1';
}

function PracownikShow(id){
	var Element=document.getElementById(id);
	if(Element.style.display=='' || Element.style.display=='none'){ Element.style.display='block';}
	else{Element.style.display='none';}
}


function CheckFormA(){
	var error = "";
	if (document.FormA.Form_Name.value==""){ error += "Please enter your name."; }
	if (document.FormA.Form_Email.value==""){ error += "\nPlease enter a valid email address.";	}
	if (document.FormA.Form_Message.value==""){ error += "\nPlease enter a message.";}
	if (error!= "") { alert(error); return false;	}
	else { return true;	}
}