function imgme(tab,id){
		tab.style.background='url(images/classnetwork/toolbar_dnet_'+id+'.jpg) no-repeat';
		tab.childNodes[0].style.display='none';
	}
	
	function deimgme(tab){
		tab.style.background='';
		tab.childNodes[0].style.display='';
	}

	function elimDefValue(testo) {
		valore = document.getElementById(testo);
		if (valore.value == valore.defaultValue) {
			valore.value='';
		}
	}
	function checkEmptyValue(testo) {
		valore = document.getElementById(testo);
		if (valore.value == '') {
			valore.value = valore.defaultValue;
		}
	}

    function load(directory){
        if(document.images){
            names=load.arguments
            pictures=new Array;
            for (z=1;z<names.length;z++){
                pictures[z]=new Image;
                pictures[z].src=directory+names[z];
            }
        }    
    }