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("Please enter a valid E-mail address")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Please enter a valid E-mail address")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Please enter a valid E-mail address")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Please enter a valid E-mail address")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Please enter a valid E-mail address")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Please enter a valid E-mail address")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Please enter a valid E-mail address")
		    return false
		 }

 		 return true					
	}


function checkForm()  {
var emailID=document.getElementById("txtEmail")

                  
    if (document.getElementById("txtName").value == "")
    {
      window.alert("Please enter your Full Name");
	  return false; 
    }
        
		if (document.getElementById("txtdob").value == "")
    {
      window.alert("Please enter your Date of Birth");
	  return false; 
    }
          
   	
	else	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email Address")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	
	 else if (document.getElementById("txtAddress").value == "")
    {
      window.alert("Please enter your Address");
	  return false; 
    }
	
	else if (document.getElementById("txtPhone").value == "")

    { 
      window.alert("Please enter your Telephone Number");
	  return false; 
    }
		
		else if (document.getElementById("txtSia").value == "")

    { 
      window.alert("Please enter your SIA Badge Number - Enter  'None' if no badge held.");
	  return false; 
    }
		
  
  }