// 从DB中读取文件并且显示的函数:
function getelevelinfo(){
	var xmlhttp=initxmlhttp();
	var class_id=document.getElementById("game_id").value;
	var sleve=document.getElementById("stleve").value;
	var eleve=document.getElementById("eleve").value;
	var url='getPL_dayprice.php?action=read&sleve='+sleve+'&eleve='+eleve+'&class_id='+class_id;
	//var url='css/operation.php?action=read&qty='+qty+'&usergrade='+grade;
	xmlhttp.open('GET',url,true);
	xmlhttp.onreadystatechange=function(){
		if(xmlhttp.readyState==4 && (xmlhttp.status==200 || xmlhttp.status == 304))
			{
				var change_getpricedy=document.getElementById("getpricedy");
				change_getpricedy.innerHTML=xmlhttp.responseText;					
		    	var change_img=document.getElementById("subimg");
				//showcontent.style.display = 'block';	
				var ch_pl_price=document.getElementById("pl_price").value;
				var ch_need_time=document.getElementById("need_time").value;
				if(ch_pl_price!='' && ch_need_time!=''){
						change_img.style.display = 'block';	
				   }
				 else {
						change_img.style.display = 'none';					 
					 }
			}
	}
	xmlhttp.send(null);		
}

function Checkplnow(){
		var game_id=document.getElementById("game_id").value;
		var stleve=document.getElementById("stleve").value;
		var eleve=document.getElementById("eleve").value;
		var pl_price=document.getElementById("pl_price").value;
		var need_time=document.getElementById("need_time").value;
	if(game_id==''){return false; }
	else if(stleve==''){return false; }
	else if(eleve==''){return false; }	
	else if(pl_price==''){return false; }		
	else if(need_time==''){return false; }		
	else return true;
	}