a jQuery tip plugin,simple to use,very small(just 1Kb),Custom styles 一个小巧，简单的jquery提示插件
$.sTip(msg,[classNmae,x,y,delay]);
msg:message,string
className:set class on tip box,string,default succ
x:offset x,can be "left","right","center" or pixels,like "200px",default "center"
y:offset y,can be "top","bottom","center" or pixels,like "200px",default "top"
delay:tip show time,in second,number,default 3
usage:
$.sTip("hello");
$.sTip("world","error","right","bottom");
$.sTip("warning","warn","center","center",10);