function isBlank(val)
	{
		if(val=="")
	    {return true;}
		
		  for(var i=0;i<val.length;i++)
			{
			if((val.charAt(i)!=' ')&&(val.charAt(i)!="\t")&&(val.charAt(i)!="\n")&&(val.charAt(i)!="\r"))
				{return false;}
			}
			return true;
			
    }


function isEmail(string)
{
  /*if ((string.indexOf('@') < 3) || ((string.charAt(string.length-4) != '.') && (string.charAt(string.length-3) != '.'))) 
   return false;
   */
       

    if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
       return true;
      else
      return true;
}


function checkName(name)
{
var re5digit=/^\D*$/ //regular expression defining a string

        if (name.search(re5digit)==-1) //if match failed
	{
		
        return true
	}

		return false;

}

function checkPassword(pwd)
	{
  
  
	   var re5digit=/^\w{6,8}$/ 
     
	   if (pwd.search(re5digit)==-1) //if match failed
        return true;

		return false;
    }


	function checkPostal(post)
	{
      
  	  var re5digit=/^\d{4}$/ //regular expression defining a 5 digit number
	   

       
	   if (post.search(re5digit)==-1) //if match failed
        return true;

		return false;
    }
    	function isNumber(number)
    	{
          
      	  var digit=/^\d*$/ //regular expression defining a 5 digit number
    	   
    
           
    	   if (number.search(digit)==-1) //if match failed
            return true;
    
    		return false;
        }