Submiting After For Loop In Page Validations

I have a for statement in my validation process I do a for loop becasue I don't know how many rows of items there are...I need to validate each item in each row. If I remove the "document.forms[0].submit(); it works perfectly...the code stops at each field that is not formated properly...but never submits. However if I leave the submit() in there, the page submits before they havw a chance to fix problems.

How can I get both to work properly?

function validate(){
for(i=1;i<=rows;i++){
if(column 1 is formated right){
alert("message");
here.focus();
}
if (column 2 is formated right){
alert("message");
here.focus();
}
document.forms[0].submit();
}