// JavaScript Document
for (i=1; i<=4 ;i++){
var file;
file="imgs/buts/but_"+i+"_on.gif";
(new Image()).src=file;
}

function butOn(N) {
var file;
var tar;
file="imgs/buts/but_"+N+"_on.gif";
tar="nav"+N;
document.images[tar].src=file;
}

function butOff(N) {
var file;
var tar;
file="imgs/buts/but_"+N+"_off.gif";
tar="nav"+N;
document.images[tar].src=file;
}

function formChk() {
with(document.feedback){
	if( name.value=="" ){
	alert("  Please enter your name  ")
	return false;
	}
	if( email.value=="" || email.value.indexOf("@")<0 || email.value.indexOf(".")<0 ){
	alert("  Please enter valid e-mail address  ")
	return false;
	}
	if( message.value=="" ){
	alert("  Please enter your message  ")
	return false;
	}
}
return true;
}