Change javascript function -

i have function in theme.js file

 $('.open_copy').click(function(){         var = $(this);         var copy = that.prev();          that.parents('.asset').find('.cover').click();         copy.css('opacity', 0).show();         if (copy.children('.copy_content').data('jsp')) {             copy.children('.copy_content').data('jsp').destroy();         }         var height = copy.children('.copy_content').css({height: ''}).height();          if (height < that.parents('.asset').height() - 37) {             var top = (that.parents('.asset').height() - height)/2;             top = top < 37 ? 37 : top;             copy.children('.copy_content').css({'margin-top': top});         } else {             copy.children('.copy_content').css({'margin-top': '', height: that.parents('.asset').height() - 37}).jscrollpane();         }          if (!that.parents('.asset').find('.close_copy').length) {             that.prev().append('<a href="#" class="close_copy">close</a>');         }          copy.animate({ 'opacity' : 1 }, 500);          that.fadeout(500);         return false;     }); 

i need change opacity value 0.9 don't have access theme.js file. there way can change/alter function adding function in html page?

copy.animate({ 'opacity' : 1 }, 500); 

yes. can remove click handler code sets up, , add own identical code except 1 => 0.9 change.

to remove code's click handler (and others), use off:

$('.open_copy').off('click'); 

...and of course add own, new click handler.

so in total, then, you'd want code (after script tag including theme.js, code runs after code):

$('.open_copy').off('click').click(function(){ // <== changed     var = $(this);     var copy = that.prev();      that.parents('.asset').find('.cover').click();     copy.css('opacity', 0).show();     if (copy.children('.copy_content').data('jsp')) {         copy.children('.copy_content').data('jsp').destroy();     }     var height = copy.children('.copy_content').css({height: ''}).height();      if (height < that.parents('.asset').height() - 37) {         var top = (that.parents('.asset').height() - height)/2;         top = top < 37 ? 37 : top;         copy.children('.copy_content').css({'margin-top': top});     } else {         copy.children('.copy_content').css({'margin-top': '', height: that.parents('.asset').height() - 37}).jscrollpane();     }      if (!that.parents('.asset').find('.close_copy').length) {         that.prev().append('<a href="#" class="close_copy">close</a>');     }      copy.animate({ 'opacity' : 0.9 }, 500);  // <== changed      that.fadeout(500);     return false; }); 

you'll want check side effects (for instance, if there's other code sets click handlers on elements, since code above remove them, too).