function selectTag(showContent,selfObj){
	// 操作标签
	var tag = document.getElementById("tags").getElementsByTagName("li");
	var taglength = tag.length;
	for(i=0; i<taglength; i++){
		tag[i].className = "";
	}
	selfObj.parentNode.className = "selectTag";
	// 操作内容
	for(i=0; j=document.getElementById("tagContent"+i); i++){
		j.style.display = "none";
	}
	document.getElementById(showContent).style.display = "block";
	
	
}
function CheckIfEnglish(String)
{
    var Letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890_-";
     var i;
     var c;
     for( i = 0; i < String.length; i ++ )
     {
          c = String.charAt( i );
	  if (Letters.indexOf( c ) < 0)
	     return false;
     }
     return true;
}
function checkForm()
{
	if (document.form_domain.domain.value == ""){
		alert ("提示：\n\n如果您要进行域名的查询，请输入您要查询的域名前缀！");
		document.form_domain.domain.focus();
		return false;
	}
	else{
	if (!CheckIfEnglish(document.form_domain.domain.value )) {
		alert("提示：\n\n您输入的域名前缀不符合要求，正确的域名前缀必须是英文、数字及“-”！");
		document.form_domain.domain.focus();
		return false;
	}
	
	}
	divProcessing.style.top = (document.body.clientHeight-parseFloat(divProcessing.style.height))/2;
	divProcessing.style.left = (document.body.clientWidth-parseFloat(divProcessing.style.width))/2;
	divProcessing.style.display = "";
return true
}