function kontrolEt(){
	var v1=self.document.Form1.site1.value;
	var v2=self.document.Form1.site2.value;
	var tf1 = isUrl(v1);
	var tf2 = isUrl(v2);

	if(v1 == "" || v2 == "")
	{
		alert("Enter something..");
	        return false;
	}

	else if(v1 == v2)
	{
		alert("Enter different sites..");
		return false;
	}

	else if((!tf1 && tf2) || (tf1 && !tf2))
	{
		alert("Not a valid domain :(");
		return false;
	}

	else if(!tf1 && !tf2)
	{
		//alert("Oh! These are not valid domains :(\n\nRedirecting to Google Fight.. :)");
		//window.location.href="http://www.googlefight.net/?kw1="+v1+"&kw2="+v2;
		alert("Oh! These are not valid domains :(\n\nExample: google.com, yahoo.com");
		return false;
	}

	else
	{
		return true;
	}  
}

function isUrl(v) {
	var tf=true;

 	var regexp = /^(|http:\/\/www.|https:\/\/www.|www.){1}[0-9A-Za-z\.\-]*\.[0-9A-Za-z\.\-]*$/;
 	tf = regexp.test(v);

	return tf;
}