Verify positive integer:
oninput="if(this.value=='00'){this.value='0';}else{this.value=this.value.replace(/\D/g, '').replace(/^0{1,}/g, '')};"
Verify valid decimals:
oninput="this.value= this.value.match(/\d+(\.\d{0,2})?/) ? this.value.match(/\d+(\.\d{0,2})?/)[0] : ''"