var top_search_interval = 100;
var top_search_seq=0; 
var top_search_cont=true;
var top_search_scrolltime = 0;
function top_search_Scroll(n,msgindex){
	if(typeof msgindex == "undefined") msgindex=0;
	msgindex = (msgindex>4)?0:msgindex;
	var m="";
	var msgs="";
	var msg = new Array();
	switch(n){
		case 1 : msg[0]="请输入关键词或要提问的内容";break;
		case 2 : msg[0]="请输入您要搜索的医院名称";break;
		case 3 : msg[0]="请输入您要搜索的医生名称";break;
		case 4 : msg[0]="请输入您要搜索的药品名称";break;
		case 5 : msg[0]="请输入您要搜索的疾病名称";break;
		case 6 : msg[0]="请输入关键词或要提问的内容问题";break;
	}
	msg[1] = "输入问题内容，点击“提问”";
	msg[2] = "提交成功即有数万专家为您解答疑问";
	msg[3] = "例如“感冒了该怎么办？”";
	msg[4] = "提交成功数万在线医生为您即时解答";
	m=document.getElementById("_form_"+n);
	msgs=document.getElementById("ask_content_"+n);
	var len = msg[msgindex].length; 
    if(!m) return false;
	msgs.value = msg[msgindex].substring(0, top_search_seq+1);
	
	top_search_seq++;
	if ( top_search_seq >= len ) {
		msgindex++;
		top_search_scrolltime = setTimeout(function(){
			top_search_seq = 0;
			if (top_search_cont) {
				top_search_scrolltime = window.setTimeout("top_search_Scroll("+n+","+msgindex+");", top_search_interval ); 
			}
			else{
				msgs.value="";
			}
		},2000);
	} 
	else if (top_search_cont) {
			top_search_scrolltime = window.setTimeout("top_search_Scroll("+n+","+msgindex+");", top_search_interval );
			
		}
		else{
			msgs.value="";
		}
}
function flush(n){
	if(top_search_scrolltime>0){
		top_search_seq=0; 
		clearTimeout(top_search_scrolltime);
		top_search_scrolltime = 0;
		document.getElementById("ask_content_"+n).value="";
		top_search_cont=false;
		document.getElementById("ask_content_"+n).onclick=function(){return void(0);};
	}
}
function reScroll(n){
	if(document.getElementById("ask_content_"+n).value==""){
		top_search_cont=true;
		top_search_seq=0; 
		clearTimeout(top_search_scrolltime);
		top_search_Scroll(n);
	}
}