求教一个有关问题

求教一个问题！
Html:function(){
var htmlstr = "";
 
htmlstr += "<div id=\"ptzBox\" class=\"ptz\">";
 
htmlstr += "<div style=\"float:left;width:112px;border-right:0px red dotted;\">";
htmlstr += "<div><input type=\"button\" id=\"turnup\" name=\"turnup\" disabled title=\"向上\" /></div>";
htmlstr += "<div><input type=\"button\" id=\"turnleft\" name=\"turnleft\" webclienttype=\"ptzcontrol\" disabled title=\"向左\"/><input type=\"button\" id=\"turncenter\" name=\"turncenter\" disabled /><input type=\"button\" id=\"turnright\" name=\"turnright\" disabled title=\"向右\"/></div>";
htmlstr += "<div><input type=\"button\" id=\"turndown\" name=\"turndown\" disabled title=\"向下\" /></div>";
htmlstr += "</div>";  
}


这里的disabled title是什么呢？看不懂 有这个属性吗？

------解决方案--------------------

HTML code

<input type="button" id="turnup" name="turnup" disabled title="向上" />