让firefox支持IE的一些方法的javascript扩展函数代码

function isIE(){ 
if (window.navigator.userAgent.toLowerCase().indexOf("msie")>=1) 
return true; 
else 
return false; 
} 
if(!isIE()){ //firefox innerText define 
HTMLElement.prototype.__defineGetter__( "innerText", 
function(){ 
var anyString = ""; 
var childS = this.childNodes; 
for(var i=0; i <childS.length; i++) { 
if(childS[i].nodeType==1) 
anyString += childS[i].tagName=="BR" ? '\n' : childS[i].innerText; 
else if(childS[i].nodeType==3) 
anyString += childS[i].nodeValue; 
} 
return anyString; 
} 
); 
HTMLElement.prototype.__defineSetter__( "innerText", 
function(sText){ 
this.textContent=sText; 
} 
); 
}

try { 
// create span element so that HTMLElement is accessible 
document.createElement('span'); 
HTMLElement.prototype.click = function () { 
if (typeof this.onclick == 'function') 
this.onclick({type: 'click'}); 
}; 
} 
catch (e) { 
// alert('click method for HTMLElement couldn\'t be added'); 
}

try { 
// create a element so that HTMLAnchorElement is accessible 
document.createElement('a'); 
HTMLElement.prototype.click = function () { 
if (typeof this.onclick == 'function') { 
if (this.onclick({type: 'click'}) && this.href) 
window.open(this.href, this.target? this.target : '_self'); 
} 
else if (this.href) 
window.open(this.href, this.target? this.target : '_self'); 
}; 
} 
catch (e) { 
// alert('click method for HTMLAnchorElement couldn\'t be added'); 
}

function captureKeys (evt) { 
var keyCode = evt.keyCode ? evt.keyCode : 
evt.charCode ? evt.charCode : evt.which; 
if (keyCode == 13) { 
// cancel key: 
if (evt.preventDefault) { 
evt.preventDefault(); 
} 
var dq = getCookie('default-engine'); 
if( dq == null) dq = "baidu_txt"; 
submit_query( dq ); 
return false; 
} 
return true; 
}