var d=document;
function getEl(el) {
	return d.getElementById(el);
}
function checkPoll() {
	var ch=false;
	var ex=true;
	var i=1;
	var el;
	while(ch==false && ex==true && i<=20) {
		el=getEl('poll'+i);
		if(el.checked) ch=true;
		i=i*1+1;
		if(!getEl('poll'+i)) ex=false;
	}
	if(ch==false) {
		alert("In order to vote, you have to choose at least one answer");
		return false;
	}
	else return true;
}

function checkSearch() {
	el=getEl('search');
	if(el.value=='search' || el.value=="" || el.value=="null" || el.value.length<3) {
		alert("You have to enter a keyword of at least 3 characters");
		el.focus();
		return false;
	}
}
function checkSearchMap() {
	el=getEl('search_map');
	if(el.value=='search map' || el.value=="" || el.value=="null" || el.value.length<3) {
		alert("You have to enter a keyword of at least 3 characters");
		el.focus();
		return false;
	}
}