The handler of Ext.grid.GridPanel

//#########################################################################//
//获得选中行
//@params:grid--> the variable of your GridPanel or the id of your GridPanel
//@return:cRow--> the selected record
//@return:false-->no select or no data
function getSelectRow(grid){ 
	var store;
	var selModel;
	if($.type(grid)=="object"){//judge the grid is Object or string ,Object is variable,string is id.
		store = grid.getStore();
		selModel = grid.getSelectionModel();
	}else{
		store = Ext.getCmp(grid).getStore();
		selModel = Ext.getCmp(grid).getSelectionModel();
	}
	if(store.getCount()>0){	    
		if(selModel.hasSelection()) {   //whether selected 
			return selModel.getSelected();    			       
		}else  
			 return false;
	}else{
		return false;
	}
}