Remove / Disable checkbox Checked / unChecked when click on click row in magento 1.9

Need to change code in grid.js (magento\js\mage\adminhtml\grid.js)

Replace code from

rowMouseClick : function(event){
        if(this.rowClickCallback){
            try{
                this.rowClickCallback(this, event);
            }
            catch(e){}
        }
        varienGlobalEvents.fireEvent('gridRowClick', event);
    },

TO

rowMouseClick : function(event){
        var element = Event.findElement(event, 'table');
        if(element.id!='depositGrid_table') {
            if(this.rowClickCallback){
                try{
                    this.rowClickCallback(this, event);
                }
                catch(e){}
            }
        }
        varienGlobalEvents.fireEvent('gridRowClick', event);
    },