add z-index: 9999; to the following selectors in the webassist/jq_validation/Default.css file:
.Default-wrapper {
left: 0;
opacity: 0.8;
position: absolute;
top: 0;
}
.Default-before {
border-color: #000000 transparent;
border-style: solid;
border-width: 17.2361px 34.4721px 0 0;
display: block;
position: absolute;
width: 0;
}
.Default {
background: linear-gradient(to bottom, #ffffff, #ffffff) repeat scroll 0 0 #ffffff;
border: 1px solid #000000;
border-radius: 6px;
color: #cc3333;
font-family: inherit;
font-size: inherit;
font-style: inherit;
max-width: 350em;
padding: 10px 15px;
position: absolute;
white-space: nowrap;
}
.Default-after {
-moz-border-bottom-colors: none;
-moz-border-left-colors: none;
-moz-border-right-colors: none;
-moz-border-top-colors: none;
border-color: #ffffff transparent;
border-image: none;
border-style: solid;
border-width: 15px 30px 0 0;
content: "";
display: block;
position: absolute;
width: 0;
}
.validation-close {
border: 0 solid #000000;
border-radius: 0;
color: #000000;
cursor: pointer;
font-family: monospace;
font-size: 12px;
font-style: normal;
font-weight: normal;
padding: 0;
position: absolute;
right: 2px;
top: 2px;
}