function checkNum(keyCode)
{

   if(keyCode==8 || keyCode==13)
		return true;

	if(keyCode<48 || keyCode>57)
	{
		//alert("Enter Numbers Only");
		return false;
	}
	return true;

}
	
	function ltrim ( s )
	{
		return s.replace( /^\s*/, "" );
	}

	function rtrim ( s )
	{	
		return s.replace( /\s*$/, "" );
	}

	function trim ( s )
	{
		return rtrim(ltrim(s));
	}


	function isValidEmail(email){
		var invchar=" ~`!#%^&*()+={}[];:'\|,<>?/\ ";
	    if (email.length == 0){
		   alert("Enter E-Mail address" )
		   return false;
	   }else{
	       if((email.indexOf("@")== -1)||(email.indexOf("@")!=email.lastIndexOf("@"))||(email.indexOf("@")==0)||(email.indexOf(".")== -1)||(email.indexOf(".") <= email.indexOf("@")+1)||email.indexOf(".")==email.length-1){
				alert("Enter valid E-Mail address");
				return false;
		   } else {
				var i=0;
				var ch;
				while ((i< email.length)){
					ch=email.charAt(i);
					i++;
					if(invchar.indexOf(ch)!= -1)
						break;
			   }

			   if(i<email.length){
					alert("This is not a valid E-Mail address")
					return false;
			   }
		 }
	 	  return true;
	  }

    }

	function isUserName(validateData)
	{
		if(validateData==null || validateData.length==0)
		{
			return false;
		}
		if(!trim(validateData)){
			return false;
		}
		var charAta;
		for(var i=0;i<validateData.length;i++)
		{
			charAta=validateData.charAt(i);
			if(!( (charAta>=0 && charAta<=9) || (charAta>='A' && charAta<='Z') || 
			(charAta>='a' && charAta<='z') || (charAta=='_') ))
			{
				//alert("Enter a valid Name");
				return false;
			}
		}
		return true;
	}