function echeck2(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")
	  return false
	}
						
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
	{
	  alert("Invalid E-mail")
	  return false
	}
						
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
	{
	  alert("Invalid E-mail")
	  return false
	}
						
	if (str.indexOf(at,(lat+1))!=-1)
	{
	  alert("Invalid E-mail")
	  return false
	}
						
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
	{
	  alert("Invalid E-mail")
	  return false
    }
						
 	if (str.indexOf(dot,(lat+2))==-1)
	{
	  alert("Invalid E-mail")
	  return false
 	}
								
	if (str.indexOf(" ")!=-1)
	{
	  alert("Invalid E-mail")
	  return false
 	}
	
	return true
}


function checkDemo(form)
{

	if(form.company_demo.value == "")
	{
	  alert("Please fill in name of company!");
	  form.company_demo.focus();
	  return false;
	}
	
	if(form.mine_demo.value == "")
	{
	  alert("Please fill in name of mine!");
	  form.mine_demo.focus();
	  return false;
	}

	if(form.fullname_demo.value == "")
	{
	  alert("Please fill in your full name!");
	  form.fullname_demo.focus();
	  return false;
	}

	if (form.email_demo.value=="")
	{
	  alert("Please Enter your Email");
	  email_demo.focus();
	  return false;
	}

	if (echeck2(form.email_demo.value)==false)
	{
	  form.email_demo.focus();
	  return false;
	}

	return true;
}