docs: function(createFlag){
  			var leftW,positionStr,idStr;
  			if(createFlag == 'fixed'){
  				leftW = parseInt(this.leftW);
  				positionStr = 'absolute;width:'+this.fixedWidth+'px;z-index:11;background:#F9F9F9;';
  				idStr = 'fixed_';
  			}else{
  				leftW = parseInt(this.leftW) + parseInt(this.fixedWidth);
  				positionStr = 'relative;';
  				idStr = '';
  				if(this.contentMinWidth > 0){
  					positionStr += 'width:'+this.contentMinWidth+'px;';
  				}
  			}
  			var htmlStr = '<table role="grid" id="' + this.options.id + '_header_'+idStr+'table" style="position:'+ positionStr+';left:' + leftW + 'px">';
  			htmlStr += this.createColgroup(createFlag);
  			htmlStr += '<thead role="rowgroup" id="' + this.options.id + '_header_'+idStr+'thead">';
  			htmlStr += this.createThead(createFlag);
  			htmlStr += '</thead></table>';
  			return htmlStr;
  		}