var is = document.getElementsByTagName('input'), dv = [], dvt = [];

for (var i=0,len=is.length;i<len;i++) {
	dv.push(is[i].value);
	is[i].i = i;
	is[i].onclick = function () { if (this.value==dv[this.i]) this.value=''; };
	is[i].onblur = function() { if (!this.value) this.value = dv[this.i]; };
}

for (var i=0,tx=document.getElementsByTagName("textarea"),len=tx.length;i<len;i++) {
	dvt.push(tx[i].value);
	tx[i].i = i;
	tx[i].onclick = function () { if (this.value==dvt[this.i]) this.value=''; };
	tx[i].onblur = function() { if (!this.value) this.value = dvt[this.i]; };
	
}