code: function calcStepsToRealHistory(sCurrentHash, bForward){
  			var iIndex = jQuery.inArray(sCurrentHash, hashHistory),
  				i;
  
  			if (iIndex !== -1) {
  				if (bForward) {
  					for (i = iIndex ; i < hashHistory.length ; i++) {
  						if (!isVirtualHash(hashHistory[i])) {
  							return i - iIndex;
  						}
  					}
  				} else {
  					for (i = iIndex ; i >= 0 ; i--) {
  						if (!isVirtualHash(hashHistory[i])) {
  							return i - iIndex;
  						}
  					}
  					return -1 * (iIndex + 1);
  				}
  			}
  		}
docs: This function calculates the steps forward or backward that need to skip the virtual history states.
  
  @private