function changeImage ( imgTagId, imageUrl ) {
	
	var imgTagElement = document.getElementById(imgTagId);
	imgTagElement.src = imageUrl;
	
}

function populateElement(selector, defvalue) {
if($(selector).attr('value') == null) {
    $(selector).attr('value', defvalue);
}

$(selector).focus(function() {
    if($(selector).attr('value') == defvalue) {
        $(selector).attr('value', "");
    }
});

$(selector).blur(function() {
    if($(selector).attr('value') == null || $(selector).attr('value') == "") {
        $(selector).attr('value', defvalue);
    }
});
}