function ktRong(str)
{
	if (str.length <=0)
		return true;

		var j=0;
		var flag=0;
		for (j=0;j<str.length;j++)
		{
			if(str.charAt(j) == " ")
				flag=flag+1;
		}
	if(flag!=str.length){		
		return false;
	}
	return true;
}


function ktEmail(s)
{   
	if (s=="") return false;
	if(s.indexOf(" ")>0) return false;
	if(s.indexOf("@")==-1) return false;
	var i = 1;
	var dodai = s.length;
	if (s.indexOf(".")==-1) return false;
	if (s.indexOf("..")!=-1) return false;
	if (s.indexOf("@")!=s.lastIndexOf("@")) return false;
	if (s.lastIndexOf(".")==s.length-1) return false;
	var str="0123456789abcdefghikjlmnopqrstuvwxyz-@._"; 
	for(var j=0;j<s.length;j++)
	if(str.indexOf(s.charAt(j))==-1)
	return false;
	return true;
}				



function ktSo(stringIn) {
	var valid = "0123456789";
	var temp="";
	for (var i=0; i<stringIn.length; i++) {
		temp = "" + stringIn.substring(i, i+1);
		if (valid.indexOf(temp) == -1) 
			return false;
	}
	return true;
}

			function checkEnterTimKiem(e){
				var characterCode
					 if(e && e.which){
					 e = e;
					 characterCode = e.which;
					 }
					 else{
					 e = event;
					 characterCode = e.keyCode;
					 }	 
					 if(characterCode == 13){
						timkiem();
						return false;
					 }
					return true;
				}		
			function timkiem()
				{
					if (ktRong(document.getElementById("idsearchsite").value))
					{
						alert("Chưa nhập chuỗi cần tìm");
						document.getElementById("idsearchsite").focus();
						return false    
					} 
					else
						window.location ="danhmuc.aspx?t=tk&l=" + document.getElementById("idsearchsite").value;
					return false;
				}