function preventSelection(element){var preventSelection=false;function addHandler(element,event,handler){if(element.attachEvent)element.attachEvent('on'+event,handler);else if(element.addEventListener)element.addEventListener(event,handler,false)}function removeSelection(){if(window.getSelection){window.getSelection().removeAllRanges()}else if(document.selection&&document.selection.clear)document.selection.clear()}function killCtrlA(event){var event=event||window.event;var sender=event.target||event.srcElement;if(sender.tagName.match(/INPUT|TEXTAREA/i))return;var key=event.keyCode||event.which;if(event.ctrlKey&&key=='A'.charCodeAt(0)){removeSelection();if(event.preventDefault)event.preventDefault();else event.returnValue=false}}addHandler(element,'mousemove',function(){if(preventSelection)removeSelection()});addHandler(element,'mousedown',function(event){var event=event||window.event;var sender=event.target||event.srcElement;preventSelection=!sender.tagName.match(/INPUT|TEXTAREA/i)});addHandler(element,'mouseup',function(){if(preventSelection)removeSelection();preventSelection=false});addHandler(element,'keydown',killCtrlA);addHandler(element,'keyup',killCtrlA)}