//给ie中的input加focus样式
sfFocus = function() {
	var sfEls = document.getElementsByTagName("INPUT");
	for (var i=0; i<sfEls.length; i++) {
	    sfType=sfEls[i].type.toLowerCase();
	    if(sfType=="button"||sfType=="image"){continue;}
		sfEls[i].onfocus=function() {
		    if(this.className!=""){
			    this.className+=" jsfocus";
	        }else{
	            this.className="jsfocus";
	        }
		}
		sfEls[i].onblur=function() {
			this.className=this.className.replace(new RegExp("\s*jsfocus\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfFocus);