var requestThumbsup;
function getRequestObjectThumbsup() {
	if (window.ActiveXObject) {
		return(new ActiveXObject("Microsoft.XMLHTTP"));
			} else if (window.XMLHttpRequest) {
				return(new XMLHttpRequest());
			} else {
	return(null);
	}
}
var thumbsGiven=false;
function sendTummbsup(sendURL) {
/*
       if (thumbsGiven){
       alert("Thumbs up given already.");
       return ;
       }
*/       
//alert(sendURL);
		requestThumbsup = getRequestObjectThumbsup();
		requestThumbsup.onreadystatechange = showThumbsUPText;
		requestThumbsup.open("POST", sendURL, true);
		//requestThumbsup.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	    requestThumbsup.send(null);
	}
	
function showThumbsUPText() {
	if ((requestThumbsup.readyState == 4) && (requestThumbsup.status == 200)) {

	var responseText = requestThumbsup.responseText;
	if(responseText=='true'){
	               thumbsGiven=true; 
		           alert("Thanks for your vote.");
	}else{
	alert("You have already voted");
	}
}
}