// JavaScript Document
function validateForm()
{
	if(document.getElementById("textfield").value == "")
	{
		alert("Name Must Be Enter");
		document.getElementById("textfield").focus();
		return false;
	}
	if(document.getElementById("textfield2").value == "")
	{
		alert("Phone No. Must be Enter");
		document.getElementById("textfield2").focus();
		return false;
	}
	if(IsNumeric(document.getElementById("textfield2").value) == false)
	{
		alert("Phone No. Must be Numeric");
		document.getElementById("textfield2").focus();
		return false;
	}
	if(document.getElementById("textfield3").value == "")
	{
		alert("Email Must be Enter");
		document.getElementById("textfield3").focus();
		return false;
	}
	if(echeck(document.getElementById("textfield3").value) == false)
	{
		document.getElementById("textfield3").focus();
		return false;
	}
	if(document.getElementById("textfield4").value == "")
	{
		alert("Please Describe Your App.");
		document.getElementById("textfield4").focus();
		return false;
	}
	if(document.getElementById("cap").value == "")
	{
		alert("Please Enter the Code shown in Image.");
		document.getElementById("cap").focus();
		return false;
	}
}

function IsNumeric(strString)
//  check for valid numeric strings	
{
var strValidChars = "0123456789";
var strChar;
var blnResult = true;

if (strString.length == 0) return false;

// test strString consists of valid characters listed above
for (i = 0; i < strString.length && blnResult == true; i++)
  {
  strChar = strString.charAt(i);
  if (strValidChars.indexOf(strChar) == -1)
	 {
	 blnResult = false;
	 }
  }
return blnResult;
}

function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}