Useful Javascript functions

#function to check a field is empty or not.

function isEmpty(fieldName){
     /*
     * This method will return true if the field is empty and return
     * false if it is not empty.
     */
        emptyFlag = true;
        if (fieldName.value == ''){ //to check the given value is empty or not
             return true;    
        }
 else{
            for(i=0;i<(fieldName.value).length;i++)
            {
      if((fieldName.value).charAt(i)!=''){
       emptyFlag = false;
       break;
      } 
     }      
    return emptyFlag;
 }   
}

#Today's date

var date = new Date();
var d  = date.getDate(); 
var m = date.getMonth() + 1; 
var yy = date.getYear();

var day = (d < 10) ? '0' + d : d;
var month = (m < 10) ? '0' + m : m;
var year = (yy < 1000) ? yy + 1900 : yy; 

//put the day, month and year in whatever format you require.

var todayDt = year+"-"+month+"-"+day

document.write(todayDt);