$(document).ready(function(){
    var keyword = $("#keyword");
    keyword.focus(function(){
        if(this.value=="Please Enter Keyword"){
                this.value="";
        }
    })
    keyword.blur(function(){
        if(this.value=="") {
            this.value="Please Enter Keyword";
        }
    })
	$(keyword.parent("form").get(0)).submit(function(){
        if(keyword.attr("value")=="Please Enter Keyword"){
               alert("Please Enter Keyword");
                return false;
        }
        if(keyword.attr("value").length<1){
               alert("Keywords is too short");
                return false;
        }

	})
//高度适应
if($("#left_commom").length>0) {
var left_nav = $("#left_nav");
var left_commom = $("#left_commom");
var mright = $("#right");
if(mright.height()<450) {
      hs2 = 450;
      mright.height(450);
}else {
    hs2 = mright.height()
}
var hs = hs2-left_nav.height()-27;
left_commom.css("height",hs+"px");
}

if($("#pkeyword").length>0) {
    var pkeyword=$("#pkeyword");
    pkeyword.focus(function(){
        if(this.value=="Product code"){
                this.value="";
        }
    })
}


})