function trim(str)
{
return str.replace(/^\s+|\s+$/g,'');
}

//display div login screen
function disp(a)
{
document.getElementById("opaque").style.display='';
document.getElementById("opaque").style.height=docht()+"px";
document.getElementById(a).style.display='';
}
function closefn(a)
{
document.getElementById(a).style.display='none';
document.getElementById("opaque").style.display='none';
						
}
function validate_feedback()
{
if(trim(document.getElementById("txtname").value)=="")
{
alert("enter your name");
document.getElementById("txtname").focus();
return false;
}
if(document.getElementById("txtemailid").value.length>0)
	{
		if(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(document.getElementById("txtemailid").value))
		{
		}
		else
		{
			alert("Invalid E-mail Address! Please re-enter.");
			document.getElementById("txtemailid").focus();
			document.getElementById("txtemailid").select();
			return false;
		}
	}
	else
	{
			alert("Please enter your Email ID");
			document.getElementById("txtemailid").focus();
			document.getElementById("txtemailid").select();
			return false;
	}
	
	
if(trim(document.getElementById("txtmobile").value)=="")
	{
		
			alert("enter your mobile number.");
			document.getElementById("txtmobile").focus();
			//document.getElementById("mobile").select();
			return false;
		}
	if(isNaN(document.getElementById("txtmobile").value))
	{
		
			alert("please enter only numbers.");
			document.getElementById("txtmobile").focus();
			//document.getElementById("mobile").select();
			return false;
		}
	
if(document.getElementById("txtmobile").value.length<8)
	{
	//alert("here");
		
			alert("please enter a valid mobile number.");
			document.getElementById("txtmobile").focus();
			//document.getElementById("mobile").select();
			return false;
		}
		
		/*
		if(document.getElementById("txtmobile").value.length>10)
	{
		
		//alert("extra");
		
			alert("please enter a valid mobile number.");
			document.getElementById("txtmobile").focus();
			//document.getElementById("mobile").select();
			return false;
		}*/
		if(trim(document.getElementById("txafeedback").value)=="")
{
alert("enter your feedback");
document.getElementById("txafeedback").focus();
return false;
}
var uid=document.getElementById("txtname").value;
var ueid=document.getElementById("txtemailid").value;
var umid=document.getElementById("txtmobile").value;
var umsg=document.getElementById("txafeedback").value;

var params = "txtousername="+uid+"&"+"txtoemailid="+ueid+"&"+"txtomobile="+umid+"&"+"txtomsg="+umsg;

//alert(params);
var oXmlHttp = zXmlHttp.createRequest();
var url="feedback_trans.php";
	oXmlHttp.open("POST",url,true);
		

                    oXmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
					oXmlHttp.setRequestHeader("Content-length", params.length);
					oXmlHttp.setRequestHeader("Connection", "close");
	oXmlHttp.onreadystatechange = function ()
	{
		if (oXmlHttp.readyState == 4)
		{
		//alert(oXmlHttp.responseText);
			
			document.getElementById("err").innerHTML=oXmlHttp.responseText;
						document.getElementById("nn").style.display='none';

			document.getElementById("ee").style.display='none';

			document.getElementById("mm").style.display='none';
			document.getElementById("su").style.display='none';
			document.getElementById("summ").style.display='none';

			document.getElementById("fee").style.display='none';

		}
	};
	oXmlHttp.send(params);
}