function del()
{
    var form = document.forms;
    for(var i = 0; i < form.length;i++)
    {
         var aktForm = form[i];
         for(var j = 0; j < aktForm.elements.length; ++j)
         {
              if(aktForm.elements[j].type != 'text') continue;
              aktForm.elements[j].onfocus = function()
              {
                    if(this.value == this.defaultValue) this.value = "";
              };
              
              aktForm.elements[j].onblur = function()
              {
                    if(!this.value) this.value = this.defaultValue;
              };
              
         }
    }
}
window.onload = del;