function img(a,b,c){
var d=new Image();
d.src=a.src
var e=d.width
var f=d.height
if (e>b || f>c){

if (e/f>b/c){
f=f*b/e;
e=b;}else{
e=e*c/f;
f=c;
}

}
a.width=e;
a.height=f;
}
function imgerr(a){
a.style.display="none"
}

function SetHome(obj,vrl){
        try{
                obj.style.behavior='url(#default#homepage)';obj.setHomePage(vrl);
        }
        catch(e){
                if(window.netscape) {
                        try {
                                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
                        }
                        catch (e) {
                                alert("此操作被浏览器拒绝！\n请在浏览器地址栏输入“about:config”并回车\n然后将 [signed.applets.codebase_principal_support]的值设置为'true',双击即可。");
                        }
                        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
                        prefs.setCharPref('browser.startup.homepage',vrl);
                 }
        }
}