function CheckEmail(sEmail)
				  {
                     var re = /^([A-Za-z0-9\_\-]+\.)*[A-Za-z0-9\_\-]+@[A-Za-z0-9\_\-]+(\.[A-Za-z0-9\_\-]+)+$/;                     
                     if (sEmail.search(re) == -1)
					   {
					     return false;
			
		                }
	                 else
					   {
		                  return true;
					    }	  
    
                  }
             function Check_Login()
					   {
					       sUsername=document.form_login.txtUsername.value;
						   sPassword=document.form_login.txtPassword.value;
						   if(sUsername.length==0)
						      {
							     alert("Vui lòng nhập tên truy cập");
								 document.form_login.txtUsername.focus();
								 return false;
							  }
						   if(sPassword.length==0)
						      {
							     alert("Vui lòng nhập mật khẩu");
								 document.form_login.txtPassword.focus();
								 return false;
							  }	   
						   else	return true;
					   }	
			function open_popup(sLink,iWidth,iHeight)
	         {
		         window.open(sLink,"_blank","toolbar=0,menubar=0,width="+iWidth+",height="+iHeight+",scrollbars=1,resizable=1");
		         return false;
		     }	
		     
		   function ChangeWordDescription(sDescription)
			 {
			 	//alert(sDescription);
			 	if(sDescription != "")
				 	document.getElementById("divWordDescription").innerHTML = sDescription;
			 }	  	   	
		     
		    function CreateQuizFlash(divID, word, description, url)
		    {
		    	var html = "<object id='movie' classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000' codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0' viewastext='true' align='' height='21' width='100' onmouseover='ChangeWordDescription(\"" + description + "\")'>"
					+ "<param name='movie' value='../images/QuizAudio.swf'>"
					+ "<param name='menu' value='false'>"
					+ "<param name='FlashVars' value='snd=" + url + "&amp;title=" + word +"'>"
					+ "<param name='quality' value='high'>"
					+ "<param name='wmode' value='transparent'>"
					+ "<param name='bgcolor' value='#FFFFFF'>"
					+ "<embed src='../images/QuizAudio.swf' menu='false' quality='high' wmode='transparent' bgcolor='#FFFFFF' name='movie' type='application/x-shockwave-flash' pluginspage='http://www.macromedia.com/go/getflashplayer' flashvars='snd=" + url + "&amp;title=" + word +"' align='' height='21' width='100'>"
					+ "</object>";
				document.getElementById(divID).innerHTML = html;
		    }