//aka makeDesignerHappy(dEl);
  function breakWord(dEl){
  
  
  if(!dEl || dEl.nodeType !== 1){
   
   return false;
  
  } else if(dEl.currentStyle && typeof dEl.currentStyle.wordBreak === 'string'){
   
   //Lazy Function Definition Pattern, Peter's Blog
   //From http://peter.michaux.ca/article/3556
   
   breakWord = function(dEl){
   //For Internet Explorer
   dEl.runtimeStyle.wordBreak = 'break-all';
   return true;
   }
   
   return breakWord(dEl);
   
  }else if(document.createTreeWalker){
  
   //Faster Trim in Javascript, Flagrant Badassery
   //http://blog.stevenlevithan.com/archives/faster-trim-javascript
   
   var trim = function (str) {
   str = str.replace(/^ss*/, '');
   var ws = /s/,
   i = str.length;
   while (ws.test(str.charAt(--i)));
   return str.slice(0, i + 1);
   }
   
   //Lazy Function Definition Pattern, Peter's Blog
   //From http://peter.michaux.ca/article/3556
   
   breakWord = function(dEl){
   
   //For Opera, Safari, and Firefox
   var dWalker = document.createTreeWalker(dEl, NodeFilter.SHOW_TEXT, null, false);
   var node,s,c = String.fromCharCode('8203');
   while (dWalker.nextNode())
   {
    node = dWalker.currentNode;
    //we need to trim String otherwise Firefox will display 
    //incorect text-indent with space characters
    s = trim( node.nodeValue ) .split('').join(c);
    node.nodeValue = s;
   }
   return true;
   }
   
   return breakWord(dEl);
   
   
  }else{
   return false;
  }
  }
  

转自: http://www.hedgerwow.com/360/dhtml/css-word-break.html