为什么这个oclick在火狐下跳转，在IE下不跳转？

当点击下面的“搜索”时，在火狐下跳转，在IE下却不跳转。<input id="shopname" type="text" name="productname" size="30"/><input id="jdspbutton" type="button" value="搜索" class="button" onclick="search_Google();return false;"/>
function search_Google() { var obj=document.getElementById('shopname'); var obj1=document.getElementById('shj'); if(obj1.value=='360buy'){ if(obj.value.trim()==''){ alert('你必须输入商品名称！'); return false; }else{ var keyword = $('#shopname').val(); } //fg = 'http://www.google.com/search?q=' + keyword +'&hl=zh-CN&domains=www.360buy.com%2Fproduct%2F&sitesearch=www.360buy.com%2Fproduct%2F'; fg = 'http://192.168.81.55/pcnp/g.php?keyword='+encodeURI(keyword); iframeOnload('googleiframe',function(so){ var callstr = so.body.innerHTML; //document.getElementById('googlediv').innerHTML=callstr+'ss'; search_360buy(callstr); }); window.open (fg, 'googleiframe'); }else if(obj1.value=='newegg'){ if(obj.value.trim()==''){ alert('你必须输入商品名称！'); return false; }else{ var keyword = $('#shopname').val(); } //fg = 'http://www.google.com/search?q=' + keyword +'&hl=zh-CN&domains=www.360buy.com%2Fproduct%2F&sitesearch=www.360buy.com%2Fproduct%2F'; fg = 'http://192.168.81.55/pcnp/g1.php?keyword='+encodeURI(keyword); iframeOnload('googleiframe',function(so){ var callstr = so.body.innerHTML; //document.getElementById('googlediv').innerHTML=callstr+'ss'; search_newegg(callstr); }); window.open (fg, 'googleiframe'); }else if(obj1.value=='taobao'){ if(obj.value.trim()==''){ alert('你必须输入商品名称！'); return false; }else{ var keyword = $('#shopname').val(); } //fg = 'http://www.google.com/search?q=' + keyword +'&hl=zh-CN&domains=www.360buy.com%2Fproduct%2F&sitesearch=www.360buy.com%2Fproduct%2F'; // fg = 'http://s.taobao.com/search?q='+encodeURIComponent(keyword); fg = keyword; // iframeOnload('googleiframe',function(so){ // var callstr = so.body.innerHTML; search_taobao(fg); // }); // window.open (fg, 'googleiframe'); } }