function checkemail(str)
{ 
 	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/  
 	if (filter.test(str))
 	{   
  		return 1;
 	}
 	else
 	{
  		return 0;
 	}
}
function checknull()
{
   
   var f = document.singinf;
	
	var msg = "Please enter data for the following fields:\n";
	var errors = false;
	if(f.firstname.value == ""){
	     msg+="-First Name is required\n";
		errors = true;
	}
	if(f.lastname.value == ""){
	     msg+="-Last Name is required\n";
		errors = true;
	}

	if(f.username.value == ""){
	     msg+="-User Name is required\n";
		errors = true;
	}
	if(f.pass.value == ""){
	     msg+="-Password is required\n";
		errors = true;
	}

	if(f.repass.value == ""){
	     msg+="-Re Password is required\n";
		errors = true;
	}
	if(f.email.value == ""){
	     msg+="-email address is required\n";
		errors = true;
	}
	if(f.pass.value != f.repass.value){
	     msg+="-Password is Miss Matched\n";
		errors = true;
		
	}
	if (errors) {
		window.alert(msg);
		return false;
	}
   if  ( !checkemail(f.email.value) )
	{
		f.email.select();
		alert("Please enter valid email address");
		return false;
	}
	if(f.securityKey.value != f.securityKeyconf.value)
	{
		document.getElementById('showmessage7').innerHTML='Security key does not match';
		f.securityKey.select();
		return false;
	}

return true;
	
}

function checksign_in()
{
    var f = document.login;	 
	var msg = "Please enter data for the following fields:\n";
	var errors = false;
	   if(f.username.value == ""){
			 msg+="-User Name is required\n";
			errors = true;
		}
		if(f.password.value == ""){
			 msg+="-Password is required\n";
			errors = true;
		}	
		if (errors) {
		window.alert(msg);
		return false;
	}
	return true;
}

//change password

function changepass()
{
    var f = document.cpass;	 
	var msg = "Please enter data for the following fields:\n";
	var errors = false;
	   if(f.old_pass.value == ""){
			 msg+="-Old Password is required\n";
			errors = true;
		}
		if(f.new_pass.value == ""){
			 msg+="-Password is required\n";
			errors = true;
		}	
		if(f.repass.value == ""){
			 msg+="-Re Password is required\n";
			errors = true;
		}	
		
	if(f.new_pass.value != f.repass.value){
	     msg+="-Password Mismatch\n";
		errors = true;
		
	}
		
		if (errors) {
		window.alert(msg);
		return false;
	}
	return true;
}




//check validation of blog

function checkblog()
{
    var f = document.addblog;	 
	var msg = "Please enter data for the following fields:\n";
	var errors = false;
	   if(f.blogtitle.value == ""){
			 msg+="-Blog Title is required\n";
			errors = true;
		}
/*		if(f.blogdetails.value == ""){
			 msg+="-Blog Details is required\n";
			errors = true;
		}	
*/		if (errors) {
		window.alert(msg);
		return false;
	}
	return true;	
}

//check validation of blog