function isBlank(val){
	if(val==null){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 isDigit(num) 
  {
	 if (num.length>1){return false;}
	 var string="1234567890";
	 if (string.indexOf(num)!=-1){return true;}
	 return false;
	}

function isInteger(val){
	if (isBlank(val)){return false;}
	for(var i=0;i<val.length;i++){
		if(!isDigit(val.charAt(i))){return false;}
		}
	return true;
	}

  function checkEmail(email) 
  {
	   var objRegExp  = /(^[a-z]([a-z_\.]*)@([a-z_\.]*)([.][a-z]{3})$)|(^[a-z]([a-z_\.]*)@([a-z_\.]*)(\.[a-z]*)(\.[a-z]{4})*$)/i;
  	 return objRegExp.test(email);
  }