var IE = navigator.appName == 'Microsoft Internet Explorer' && navigator.userAgent != 'Opera';
var SPACER = 'images/elements/empty.gif';

if ( IE ){
    window.onload = function(){
        window.png = new PNGTransparency();
        window.png.create();
    }
}

/**
* Shows the transparency of pngs in internet explorer.
*/
function PNGTransparency(){
    this.create = PNGTransparency_create;
}

/**
* Creates the transparency effect for each image.
*/
function PNGTransparency_create(){
    var i, img, oldsrc;
    var imgs = document.getElementsByTagName( 'img' );

    for ( i=0; i < imgs.length; i++ ){
        img = imgs[i];		
        if ( img.src.indexOf( '.png' ) != -1 ){
            oldsrc = img.src;
            img.src = SPACER;
            img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + oldsrc + "', sizingMethod='image')";
        }
    }
}

function clearInput(p_field){
   	p_field.value = '';
}

function leaveInput(p_field, p_value){
    if(p_field.value == ''){
      p_field.value = p_value;
    }
}